The whole car vibrates when the engine idles. It's especially bad on Reverse. Neutral vibrates, but it's slightly better. Drive idle is almost as bad as Reverse. Could this be a mount problem?

The car sounds fine at RPMs past around 800 or so. Problem is, the idle stays around 500. I put the tranny on N at traffic lights to slightly alleviate the vibrations.

All comments/suggestions/advice welcome.

Thanks.