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Possible causes:
- Vacuum leaks. Most likely scenario. Unmetered air is causing havoc
- OVP relay. Usually comes with dash light funkiness
- Sticking air meter plate
- Fuel filter
- Bad coolant temp sensor
- A wire fell off
- sticking fouled or failing idle air valve
Rule out vacuum leaks first. There are many many places for those to occur and the m103 has several custom molded air hoses that like to crack, particularly the one that goes to top of the engine next to the valve cover.
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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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