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Originally Posted by leonb
I have a 1999 C280 (V6) which idles slightly rough. Its not a constant rough idle. It will idle smoothly for say about 5 sec and then it will shake slightly- idle smooth, then shake. .............
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Sounds like the AC engaging on and off with the auto climate control. Did you try setting it on economy mode? Mine also did this when the water pump started to go bad (seizing bearings), but this was accompanied by a squealing belt. I have a 98C280, same V6 engine.
MarkC