Engine n45b16a 2005:
Driving at 1200 rpm and pressing the clutch idle speed going down often to 530 rpm and after one two second they are returning to the standards 760 rpm. Driving at 1500 or 1000rpm there is no problem and the turnover is gentle. I checked the air flow mas, throttle, left air, Camshaft sensor, membrane for valve cover. Someone had a similar problem. Sorry for my bad English