I have a 98 grand prix the car will die when I take my foot off the gas. The speed odometer will fluctuate. Sometimes I can feel it down shift when I take my foot off the pedal. Sometimes splitters wh

Hi Cheyenne:
- For the vibration, I'd be checking universal joints or CV jounts.
- Sounds like you've got your brakes figured out already. Time for some maintenance.

Much of the shifting in today's vehicles is done using various sensors and it seems some of them are off. You may need to take it to a shop for testing.

are there any codes this is the link to my garagehttps://www.facebook.com/TedsRepairs

Engine stall or RPM fluctuates at idle.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

Might be your fuel pressure regulator.. also your car might be vapor locked.Next time it shuts off loosen your gas cap... If you hear it sucking in air... that's your problem...or your catalytic converter is clogging up...check the sensors on the pipes..If there bad it tells your car it needs more gas when it really don't...you will smell gas

clogged catalytic converter perhaps?

This is a known issue for your model and for GrandAm's. Best to take it to your dealer.

change the spedo cable to tranny... autozone $25.00

If the vehicle cranks normally when not starting check the tach see if it is reading any engine speed. Sounds like the crank sensor is going bad very common fault on the 3800 series 1 & 2 engines. You must remove the harmonic balancer to replace the sensor.

i think your exhaust might have a leak which is heating up your oil when this happens the engine suffocates and wants to die.