...smoke while running whats the problem? it has been running ok til today have only had the car for roughly 6 mths but think the person i purchased it from has lied as they said nothing was wrong!!!!!!!!!! the head gasket has been previously replaced in the car, it is on LPG but cant run on petrol as the injectors need replacing , it seemed ok til the main part of motor started vibrating & blowing smoke if any1 has any suggestion as to what the problem could be plz let me know, as i dont know if i should try to drive it to mechanics or get a mobile mechanic out .