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Old 09-29-2003, 10:48 AM
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I had a similar problem on an '85 500 SEL. The car would "chug" or "shudder" under acceleration - usually just when I started it cold but not always. Also, at idle at traffic lights the engine would sometimes skip, and the oil pressure gauge would fluctuate.

As it turns out, the problem was some bad spark plugs. My mechanic replaced a few and now the car runs fine.
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