Smoking just started yesterday out of the Blue. Car looses power and smokes really bad. Car spits and sputters. Not sure if it's a bad tank of Gas or what. It does have codes on it, but has had them a while. This has been on and off again problem last couple drives. The codes are P0456, P0491, P0492. Car started this morning with no smoke at all, then came back right as I pulled into driveway. Any help appreciated.