my 82 300sd has been idling roughly on first start. If I rev it up a few times and drive around when you stop, the car idles fine. She will blow out small amounts of white smoke while idling. I've not been loosing any coolant or oil. When I get on the pedal driving at high rpm's she will blow out a small amount of black smoke just before she shifts out. So, if i'm not loosing any coolant what would be causing the white/gray smoke while idling?