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Have them check the rubber boot under the AFM, that is the Air Flow Meter you are refering to the throttle is underneath it. There is a rubber boot on the bottom of the AFM that is between the AFM and the actuall throttle body. This tends to crack and is a $20 part, mine is actually starting to crack. If it cracks it lets air by the AFM and into the throttle body below. Thus bypassing the AFM and its ability to tell air flow. Also check for vacuum leaks on all connectors. I replaced all rubber connectors under the hood and idle quality improved greatly. I also had a bad one or two on the HVAC system in the car and fixed them and all ran better. Sometimes it is the little things that get you.
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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.....
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