The car idles fine and u can rev the engine without problem but wen u put it into gear and release the clutch and take of it jerks hesitates and will sometimes backfire in the intake
Check compression is it more then 10% difference between cylinders you have a leak also check for fouled plugs. wires fuel pressure, catalytic converter. i have the same problem in my lincoln its a leaking valve seat
SOURCE: Engine hesitation, the trac off light comes and car hesitates.
ABS sensor on wheel hub bearing. I had the same problem cange it and problems went away
SOURCE: 98 pontiac bonneville hesitation and jerking
When was the last time spark plugs and wires where done? That could be a possible cause, also check the timing through the distrubotor cap.
Hope this helps
SOURCE: 1995 Pontiac Firebird Problem
It would help to know what size your engine is and how many miles are on it. Some things it could be are: dirty fuel filter, spark plugs and or wires, low fuel pressure. clogged or dirty fuel injectors, leaking EGR valve, vacuum leaks or faulty emissions system.
Good luck
SOURCE: Engine hesitation, the trac off light comes and car hesitates.
This is just a shot... Get a Can of "SeaFoam" and pour it into your gas tank with a full tank of gas. Then take it for a "Spirited" drive on the freeway or highway for at least 30 minutes to an hour. (Longer is better) i have had many cars with a little hesitation or sputtering fixed with this awsome product. it is a very powerful cleaner that has chemicals that other brands simply do not have. Conditions should have improved after your 1 hour drive. and will continue to improve as you continue to drive with that treated tank of gas. If the problem persists then you need to get the OBD trouble codes and let it direct you to the failed part. At least you would rule dirt "Out of the Question" (Also read the can for other things that Seafoam can fix on your car and how to use it) also does wonders for a couple cap-fuls in the lawn-mower...Chainsaw....Snowblower...etc i Hope this helps you out... Good Luck!
SOURCE: 1998 Pontiac Bonneville SE 3.8L Backfires/ Sputters
sounds like the ignition module is going bad.
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