While you're in there, check the idle air hoses previously mentioned in this thread. (see the yellow arrow). These hoses get hard and brittle and stop sealing around the ends. There is another idle air hose coming out the other side of the idle air valve, but you can't see it in this picture. They caused me tons of grief.
Also, you can easily test your idle air valve from here. Pull off the wire (blue arrow) and put a 9v battery to the terminals. You should hear it clunk.
M.B. Doc is an expert (I'm not), so heed his advice!!
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-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
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