Hi, I am new to the forum. I have a 2005 Dodge Neon SRX with almost 196K miles. Two years ago all of the motor mounts were replaced and last fall the Idle Air Control Motor and valve were replaced.
The car vibrates badly at idle and when the air conditioner is on. Any ideas of how to fix that?

 

Were the mounts factory or aftermarket? If they were aftermarket, there's your answer, most likely.