Have 95 Cutlass Supreme and this morning it had a slight virbration (kind of like a small quick surging) when accelerating. It has 120K miles and is on it's 3rd tranny and has some trannny shifting problems at around 40mph. When not in gear the vibration is barely noticeable, but once it is put in gear you cna feel it a lot more and when the accelerator is pressed you can really feel th vibration. The vibrations is a lot less noticeable when not accelerating. Once speed is above about 25 I do not notice the vibration. It feels sort of like the engine is "missing" but the tach appears pretty steady. Acceleration is also somewhat weak (has had a bit of a hesitation for quite a while).
Any suggestions.