This has a 4G63 Mitsi engine with the electronic thottle, also a catalaytic muffler. On start up it has a large amount of white smoke that comes from the exhaust..........now I know what everyone is going to say.........HEAD GASKET..........but.........the smoke is not sweet smelling the coolant levels are not going down at all and the engine runs great. I suspect condensation in the muffler but have never seen it that bad. Any thoughts would be appreciated