Welcome to the forum, Jim. There are a lot of knowledgeable people to give advice and help you out, but you need to help them out a bit too. We need model, year, mileage, and a brief amount of maintenance history and description of what you've already done in the way of testing or replacement parts in an attempt to correct your current symptoms.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't