Hi,
It's a 1987 300E with manual five speed. Car iddles fine but when I coming to a stop and take my foot of the accelerator to press the clutch and the brake the iddle races down below 500 rpm and cut off. On the other hand if I conpress the engine down to a stop it does not cut off. Advise please.

Thank you

Please do search on the Over Voltage Protection relay (OVP), its a good place to start at least...

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)