i have smoking coming out my exhaust from time to time but its only when i am idling and if i hit the gas it goes away. plus its whiteish smoke and it smells alot like gas soo i think i am running really rich since i have my check engine light on and the reason for that is the secondary o2 sensor. correct me if i am wrong but i think the computer is trying to fix the problem an its just dumping more fuel into the engine