My 2006 Buick LaCrosse will not exceed 3500 R.P.M
why won't my 2006 buick lacrosse exceed 3500 r.p.m.?

The 2006 Buick LaCrosse enters its second year relatively unchanged. It does get some much needed standard safety features, which were either optional or not available at all last year. These include side curtain airbags and ABS brakes across the line.
Trying to compete with upscale mid-size sedans, like the Camry, the 2006 LaCrosse packs a lot of features into the base model CX. Power seats, windows, and locks, cruise, control, and air conditioning are all standard. The luxury CXL adds leather seats and dual-climate control. Both the CX and CXL are powered by Buick's old 3.8-liter, 200-hp V6. For a more interesting and responsive ride, the CXS features a 3.6-liter, 240-hp V6, with sports suspension and bigger 17-inch wheels. It also has an exclusive option of Stabilitrak traction control. The 2006 LaCrosse seats five, with a split-fold rear seat in all but the base models. A front bench seat that holds three is optional, with the center seatback flipping down to turn into a console. For this reason, the dash has been made flat, rather than curved out.
QuietTuning is part of the 2006 LaCrosse build, and it seems to successfully keep out road and engine noise, according to owners. The ride is smooth and quiet, and though the old V6 has decent pedal response, the new 3.6 V6 is pleasingly powerful. The exterior styling is refined and elegant, say many drivers, but the interior is made out of cheap plastic, right down to the fake wood trim. Other drawbacks include uncomfortable seats, no exterior trunk handle, cramped rear legroom, instrument panel glare that makes it hard to read the gauges, and so-so gas mileage.
why won't my 2006 buick lacrosse exceed 3500 r.p.m.?
While driving the car and I go from a stop to about 2-3k rpm and release the gas completely, the car will either come very close to stalling and go back up to idle speeds 800-1k or completely stall requiring the key to be turned.
Out of seemingly nowhere my electrical systems are all fucked up, the only way i can start the car is by turning the key forward all the way and quickly moving back to the first key position then going to second position and then sometimes it will start. When started everything that works is as follows: Windows, side mirrors, cabin light, locks, trunk opener, pull down mirror lights, sunroof, fans and direction of fan changer, cruise control (?), Headlights/brights, garage door opener (?), Passenger air bag off/on indicator, brake lights, odometer, both lighter ports, rear view mirror controls. Everything that doesn't work is as follows: Rpm, speedometer, gas meter, temp meter, (all go to 0 when it starts but doesn't go higher) radio, seat warmers, hazards, ac compressor, cd player ejector, steering wheel temp controller. None of the Fuses are blown and it has basically a brand new battery (refurbished from ACME)
Nothing on my dash works except the back lighting. No fuel gauge, speedometer, rpm, oil pressure, absolutely nothing works on the DIC or dash. Is it a fuse, or relay, or something more complicated???
Air Conditioning
Climate control front air conditioning · Dual front air conditioning zones
Airbags
Side curtain airbag delete · Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side curtain airbags
Audio System
Single disc in-Dash CD · AM/FM radio
Brakes
ABS: 4-wheel · Front brakes: ventilated disc · Rear brakes: disc
Comfort Features
Floor Mat Material: carpet · Floor Mats: front · Steering wheel trim: leather
Convenience Features
Center console: front console with storage · Memorized settings: driver seat · Multi-function remote: trunk release · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: seatback
Driver Seat
Adjustable lumbar support: power · Power adjustments: 6
Headrests
Front headrests: adjustable · Number of front headrests: 2
Instrumentation
Warnings and reminders: low fuel level
Lights
Headlights: Auto on/off
Mirrors
Exterior mirrors: power
Passenger Seat
Manual Adjustments: 4
Rear Seats
Type: bucket
Roof
Sunroof: power glass
Seatbelts
Rear center seatbelt: 3-point
Seats
Driver seat power adjustments: height · Front seat type: split-bench · Passenger seat manual adjustments: reclining · Rear headrests: adjustable · Upholstery: cloth
Spare Tire
Mount Location: inside
Suspension
Front Arm Type: lower control arms · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Suspension Classification: independent · Rear suspension type: trailing arms · Stabilizer bar(s): rear
Telematics
Satellite communications: OnStar
Tires
Type: all season
Tires and Rims
Wheels: steel
Wheels
Wheel covers: full
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Side curtain airbag delete · Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Front side curtain airbags
Audio System
Single disc in-Dash CD · MP3 player: CD MP3 Playback · AM/FM radio
Brakes
ABS: 4-wheel · Front brakes: ventilated disc · Rear brakes: disc
Comfort Features
Center console trim: simulated wood · Dash trim: simulated wood · Door trim: simulated wood · Floor Mat Material: carpet · Floor Mats: front · Shift knob trim: simulated wood · Steering wheel trim: leather
Convenience Features
Center console: front console with storage · Multi-function remote: keyless entry · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: door pockets
Driver Seat
Adjustable lumbar support: power · Power adjustments: 6
Headrests
Front headrests: adjustable · Number of front headrests: 2
Instrumentation
Warnings and reminders: low fuel level
Lights
Headlights: auto delay off
Mirrors
Exterior mirrors: heated · Inside rearview mirror: electrochromic
Passenger Seat
Manual Adjustments: 4
Rear Seats
Type: bench
Roof
Sunroof: power glass
Safety
Parking sensors: rear
Seatbelts
Rear center seatbelt: 3-point
Seats
Driver seat power adjustments: height · Front seat type: bucket · Passenger seat manual adjustments: reclining · Rear headrests: adjustable · Upholstery: leather
Spare Tire
Mount Location: inside
Suspension
Front Arm Type: lower control arms · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Suspension Classification: independent · Rear suspension type: trailing arms · Stabilizer bar(s): rear
Telematics
Satellite communications: OnStar
Tires
Type: all season
Tires and Rims
Wheels: painted aluminum
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Passenger airbag deactivation: occupant sensing deactivation · Rear side curtain airbags
Audio System
Single disc in-Dash CD · MP3 player: CD MP3 Playback · AM/FM radio
Brakes
ABS: 4-wheel · Front brakes: ventilated disc · Rear brakes: disc
Comfort Features
Center console trim: simulated wood · Dash trim: simulated wood · Door trim: simulated wood · Floor Mat Material: carpet · Floor Mats: front · Shift knob trim: simulated wood · Steering wheel trim: leather
Convenience Features
Center console: front console with storage · Multi-function remote: keyless entry · Reading lights: front · Steering wheel: tilt and telescopic · Steering wheel mounted controls: cruise controls · Storage: cargo net
Driver Seat
Adjustable lumbar support: power · Power adjustments: 6
Headrests
Front headrests: adjustable · Number of front headrests: 2
Instrumentation
Warnings and reminders: low fuel level
Lights
Headlights: auto delay off
Mirrors
Exterior mirrors: power · Inside rearview mirror: electrochromic
Passenger Seat
Manual Adjustments: 4
Rear Seats
Type: bench
Roof
Sunroof: power glass
Safety
Parking sensors: rear
Seatbelts
Rear center seatbelt: 3-point
Seats
Driver seat power adjustments: reclining · Front seat type: bucket · Passenger seat manual adjustments: reclining · Rear headrests: adjustable · Upholstery: leather
Spare Tire
Mount Location: inside
Suspension
Front Arm Type: lower control arms · Front Suspension Classification: independent · Front Suspension Type: MacPherson struts · Rear Suspension Classification: independent · Rear suspension type: trailing arms · Stabilizer bar(s): front
Telematics
Satellite communications: OnStar
Tires
Type: all season
Tires and Rims
Wheels: painted aluminum
Windows
Front wipers: intermittent