Hey all;

I've got a 1991 300E with 192K on it. It runs wonderfully and I truely love it. One problem. It vibrates while stopped in gear... worse with the AC on. According to the tach, it's running at about 700rpm in gear with the AC on. If I put it in neutral it smooths right out, even with the AC on and it seems like the RPMs increase to approx. 800-900.
Any ideas? I once read that if the passenger seat vibrates while stopped and in gear, it's the motor mounts. Any truth to that?

Nick