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Check these items, it's pretty easy:
1) Air meter plate operating freely
2) Throttle linkage adjusted properly and actuating idle switch properly, lubed and not sticking.....
3) Idle switch actually working - test with ohmmeter
4) Idle air valve clean and working - remove, spray with carb cleaner, test with fresh 9v battery
5) Throttle butterfly closing properly (a little harder to check but doable)
6) Coolant temp sensors working properly - test with ohmmeter - search posts here, there are many on testing these.
7) Cold start injector not spraying constantly (pretty rare that it is)
My bet is that it is something to do with the idle circuit, either the switch or the air valve.
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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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