I was wondering if anyone knows what might be causing some vibration when the car is warmed up. I have a 94 GXE with 95k on it.. when I'm in drive and at a stop sign, the car vibrates a little to a decent amount.. enough for me to feel a buzz in the seat of my pants. When the car is in park, it feels like the engine is knocking a little, get that ping jolt feeling... Otherwise the car is smooth.. once the drivetrain is going it is smooth as butta and I love it. Shifting is smooth, etc. Its a nice car all around save for this vibration/knocking business. Any ideas? TIA...

 

I have it on my old car with 100K+ miles on it also.

Could be from..

1. Leaking vaccume line
2. Cloged/dirty fuel injector or fuel filter
3. Dirty spark plugs

check the basics like filters and hoses.

For now I just cranked up my idle until I can test/clean the fuel injectors.