Rough Idle on 99 SL2

I have a 99 SL2 that runs perfect, however it has a VERY rough idle. It shakes the mirrors, shakes the dash. Everything looks to be in excellent condition. Runs very smooth, no misses, no trouble codes, mounts all look to be tight, but still shakes entire car.

Please help!!!

I would check the top engine mount for being broken. usually the problem