Hi guys.my 1995 C280 has my CEL is on with the code PO505 idle air control system.
car is a lumpy idle when first started, and occasionally stalls out, but if you gently press the throttle to get the revs up and give it a few thousand RPM for a minute or so it is OK. It then runs aboslutely perfectly, never misses a beat, gives good power and acceleration and pretty good fuel economy.
Any clues as to the best things to check out etc?
thanks
Carl