I have a 2001 C320. Recently I have noticed my car acting strangley. For example, if im at a stop sign, and i roll forward slightly to get a better view, the whole car will start to hesitate and shutter. As soon as i press the gas the car smooths out and goes fine. Its just the initial rolling from a stop that makes the vehicle shake. Any ideas?

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2001 Mercedes-Benz C320 3.2
1991 Mercedes-Benz 300E 3.0