Hah! Glad I guessed right for once on the idle switch.

Now I'm going double-or-nothing and I'm gonna bet that you have a vacuum leak that is just on the verge of drivable.

Check the hose from the valve cover side to the intake manifold. Check underneath, it likes to crack there. Also check the hoses going to and from your idle air valve, and all vacuum rubber in general.

Good luck!

__________________
-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition