Hey. My car get white exhaust smoke that smells coolant on startup on warm engine, doesnt happen when its cold. Smokes for 10 sec then its fine. Cant fint any coolant in the oil, or oil in coolant. Also had the car running without the radiator cap on but no bubbles. It also stutters on acceleration. Any tips to what it could be? Plugs look good to and compression is also good. Have ordered new headgasket.