What is a good upgrade for the price to really give my focus svt that little edge?
Upgrades on SVT Focus

Upgrades on SVT Focus
my 2002 ford focus svt i was drive it it was running great i just left the red light and it just die i still had power it just stalled try to restart it would just turn over try pull starting it nope my son put a code reader to it it said ignition fault we chage ignition senor cam,and crank senors got fuel and spark timing belt good can it be my key lost it program single i only have one key
hello im kinda new to this so some help from someone who really knows what they are talking about would be great. 1.I just recently bought a 2002 svt focus, it runs great pulls hard ect. the only concern i have is that when im at idle the rpms sometimes drop to about 900 and it will stay consistently at 900 then other times it will idle at around 1200, then other times it will idle like im driving a big block with some insane cam and the rpms just keep jumping way down and just catching again. 2.Also, when im idling at a light the car shakes somewhat violently, i notice it mostly in the steering wheel and left mirror, the mirror is useless at the rate that it is vibrating at and the steering wheel gets blury because of the intense vibration. The car only has 58,000 miles on it and i really dont want to have to be replacing motor mounts already. or if this is just normal in the svt's? 3.yet another issue, at the lot that i bought the car from the battery died. which i beleve the car has some reset safety code that i have to enter to get my radio/clock/cd player working. 4.And another one of my problems is that i believe that it is a cv boot? the rubber accordion looking thing that covers the joint to the wheel. that boot has about a 1 inch tear that has leaked grease. if anyone who reads this could give me some advice that would be a great help. im a 16 year old kid who is kinda on a budget. any help out there?
Airbags
Dual front airbags
Audio System
Single disc in-Dash CD · MP3 player: CD MP3 Playback · AM/FM radio
Brakes
ABS: 4-wheel
Comfort Features
Shift knob trim: alloy · Steering wheel trim: leather
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt and telescopic · Steering wheel mounted controls: audio
Mirrors
Exterior mirrors: heated
Rear Seats
Type: split-bench
Roof
Moonroof: power
Seats
Front seat type: sport bucket · Heated: front seats · Upholstery: leather
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent