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Rough idle on these cars is something discussed with incredible regularity on this board. Do some searches for EHA adjustment. Another search for cleaning idle control valve. Also changing the rubber hoses to/from the ICV can help. There is also info on MBCA website on how to bump up idle 50rpm which can help with rough idle.
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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car
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