Bad EHA, Bad O2, check plugs to make sure no oil or coolant on them signifying head gasket leak. Or maybe Bad OVP. Without OVP the car will run more rich and shake as well. Have you tried to adjust base mixture yet? Could also be a shot lambda tower that has made the Mixture rich.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....