vibration
 

I have a '91 190e 2.6 with 83,000 miles. Recently, when I stop at a stoplight and the car is still in drive there is a vibrating noise, so I put it in neutral to get rid of the sound. Any ideas as to what the problem may be and cost??? Tansmission fluid is ok. Never been changed etc. Thanks Annette
P.S.
The weather has been below 32 degrees F. here this past week.

I would suspect your motor mounts are worn out and need replacing.

Usually these are replaced every 100,000 miles or so, cut considering the age of your car and the miles, this wouldn't be an unusual replacement.

does putting it in reverse make it go away?

vibration
 

suginami was exactly right on about the motor mounts. I have 2 cracked motor mounts. thanks for the help guys... I will be happy when my car is running smooth again.