I replaced a leaking EHA on my 1991 300e the other day,cleaned/washed engine .Started engine (eng temp cold)and all was normal so I went for a ride...ran as specified. turned off engine ,re started 1/2 hr later,idle speed 1500 in park!drove car several miles , idle returned to normal!Its acting like a stuck choke when engine is started warm after sitting for a few minutes!RUNS normally when started cold! ANY IDEAS?Unpluging the idle control valve with the engine @1500 reduces idle to normal.Any help would be greatly appreciated! THANKS,DAN