All of the vacuum lines are pretty visable. Check all the rubber connectors for cracks, they get old and brittle and form cracks. Also just verify they are all connected somewhere. Then under the air cleaner you will see the Idle Air Control Valve and the Rubber bigger lines that connect that everywhere. Should be at least 4 pieces. Check them to make sure they are not hard and brittle. New ones are maybe 6 bucks a piece and very flexible. You could also clean the IACV as well with Carb Cleaner. And clean inside the Air Flow Meter as well, AFM....

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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.....