i should of said this up front..i bought it in november with only 247 miles on it from the dealer..it has never been sold rented or anything..just floating to one dealer to another..so it has been sitting around i have to replace the fuel pressure pump cuz it has never worked right and i never changed the fuel filter..i would like to believe it is those two causing it..maybe somewhere down the road the pump stops momentarly and causes a misfire and the smokes comes out..dont know..all i know is that is making me made and there are no codes thrown..and mechs dont know what i am talking about..