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.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

does putting it in reverse make it go away?

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.