It is you water temp sensor! It tells the CIS-E system when the engine is cold and when to activate the Cold Start Valve as well as the IACV to increase idle. Less than $50 and is the most likely problem. I have posted test procedures for it a bunch of times here so search my userid.

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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.....