Check to make sure none of the motor mounts or trans mounts are worn. They have rubber in them to absorb the vibration. Also, check to make sure there are no engine vacuum leaks that could cause the engine to run rough. Also, Check and clean the idle air control valve.

Answered by Jacobandnickolas (expert)
57,318 answers provided

Jacobandnickolas , Thanks for the advice. It's my first car so I don't know too much about cars... I took off and cleaned the IAC valve with carb cleaner, no results. At all. I don't know how to check for vacuum leaks... But wouldn't there be some sort of difference in the engine's performance if it had to do with that? My rpm idle speed is normal and doesn't move, temp is normal, engine performance is fine. Just this darn vibration at idle. All points to the mounts right? Those sound like something I can check myself, what about replacing them? I have a good set of tools/jacks/stands. Worth doing myself?

Response from samueltietjen
1 question asked

There are how to instructions on the homepage for looking for a vacuum leak. As far as the motor mounts, it could be the, I would hate to see you put the time and money into them if they are good.

Answered by Jacobandnickolas (expert)
57,318 answers provided

Yeah... My plan is to look for a vacuum leak, and if that's not it, to take it to a mechanic and have them check the mounts for me. I definitely don't want to replace them if they aren't bad... They look to be about $90 a piece, but maybe the trans mount is good and the engine mounts are bad, or the other way around. A mechanic should be able to tell me... Thanks again

Response from samueltietjen
1 question asked

I hope I helped

Answered by Jacobandnickolas (expert)
57,318 answers provided