Why wont my car start?
New plugs, wires, and distributor cap but cranks with no start, what can it be and why

The Cadillac Seville came with a 4.9 L, 200 hp V8 engine with 4 speed automatic for 1991, an upgrade of 20 hp from the previous year. Cadillac also adjusted the tail lights, the exterior, and the transmission for better acceleration. Otherwise, the Seville stayed with the same successful formula that had sustained the brand for decades. The Seville has 4 doors and seats 5. Gas consumption runs from 16 mpg in the city to 26 mpg on the highway. ABS brakes, air conditioning, power windows, and power door locks come standard. Options include sunroof and leather seats. Trunk space comes out to 14.1 cubic feet. In addition, the Seville comes in 2 trims: the STD and the sportier STS. Overall, drivers give positive feedback on the 1991 Cadillac Seville. Most reviews focus on the elegant design and solid handling. Some consumers would have liked more gas mileage and better interior design. Despite its shortcomings and relatively advanced age, the Seville should appeal to just about anyone seeking an affordable luxury sedan.
New plugs, wires, and distributor cap but cranks with no start, what can it be and why
What size srew go to the lower part of the starter
Okay, I have a 1992 Cadillac Seville sts. Has a 4.9ltr pfi engine. So far the list of things I've done, 1. A transmission service dropped the pan new fluids filter and gasket. 2. Octane booster in my gas. 3. New plugs. 4. New fuel filter 5. New catalytic Any ideas what could be causing me to over rev when I step on the gas pedal feels like the car could be in limp mode but there is no check engine light, but I can get up to 100 if I go down hill and it decides to shift past 3rd. If I hit a hill forget it lol my car slows down over revs won't lose speed unless I floor it and then it drops slowly and wo t gain anything. No idea what this could be I have done the lucas no slip when I did the service and it shifts fine if I don't floor it no hard shifts notging.
I want to recharge ac but there is some type of wires connection to low side. Do I just unplug and unscrew it? Car has been converted already
There is a white wire with a metal prong hanging down from a bigger black wire right under the driver side dash and its just long enough to reach the fuse box
Air Conditioning
Automatic climate control front air conditioning
Airbags
Driver side front airbags
Audio System
Antenna Type: power · Single disc in-Dash CD · Premium Brand: Bose · AM/FM radio
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt-adjustable
Exterior Features
Paint: special factory paint
Lights
Exterior entry lights: security approach lamps · Headlights: Auto on/off
Mirrors
Exterior mirrors: heated · Inside rearview mirror: electrochromic
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: cloth
Suspension
Air Suspension: rear · Leveling: self leveling suspension
Tires and Rims
Wheel covers: wire · Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning
Airbags
Driver side front airbags
Audio System
Antenna Type: power · Single disc in-Dash CD · Premium Brand: Bose · AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Steering wheel: tilt-adjustable
Lights
Headlights: Auto on/off
Mirrors
Exterior mirrors: power · Inside rearview mirror: electrochromic
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: leather
Suspension
Air Suspension: rear · Leveling: self leveling suspension
Tires and Rims
Wheel type: aluminum alloy