I have '98 Pontiac Grand Prix GTP Supercharger 3.8L. This week the check engine light came on and car would buck like a horse when accelerating after a stop. Not always...but sometimes. Got the codes, there were three of them.
-#3 cylinder mis-fire
-#3 fuel injector
and
-Torque converter clutch circuit stuck on
I fixed the first two, new spark plugs, new wires, new #3 fuel injector. Not sure what to do about the other one or if it was still a problem so I reset the light. Drove around all day, no problems. My wife gets in and goes to the store and same thing happens, check engine light came on and car bucked like a horse when accelerating after a stop.
A friend told me that it could be the tranny starting to have problems - someone else said changing the tranny fluid and filter might fix it. Guy at Autozone said my engine mounts might need replacing and this might be causing the problem..I saw in another post that it might help to put in some Sea Foam or Lubeguard? I don't know what to try or do first! I'm told that front engine mounts are dealer items and the bottom 2 are approx. $100 Could motor mounts actually cause the TCC to stick in the on position? The motor does move some when I shift from Park to Reverse to Drive, etc...but how can I tell if mounts are really bad? Don't want to replace them only to have the same problem. Are there any other things that could cause this that I might be missing?
Thanks for any help at all!
Shadillac28