Faulty spark plugs or wires
Faulty ignition coil
Faulty oxygen sensor, unlikely but possible
Faulty fuel injector, test to see they are getting proper voltage at proper time.
Burned exhaust valve, test with compreession test.
Faulty catalytic converter, exhaust smell like bad eggs? If so replace it
Stuck/blocked EGR valve, take apart and clean, may be stuck open due to carbon build up
Faulty camshaft position sensor
those are just about all of the solutions.
If the car stumbles or hesitates when accelerating then check the sparks, wires, and dist cap & rotor first.
Sunday, November 18th, 2007 AT 9:17 PM