It seems thatI spoke too quickly. Car was idling just fine for a whole day but idle hunting came back next day. I am still suspecting 2 switches - throttle position sensor (variable) and idle position sensor (on/off). Does anyone know testing procedure for these switches? Also, I cannot find throttle position sensor by itself - do I need to purchase the entire throttle housing, if the throttle position sensor is faulty?

Thank you!