My van idles rough and engine light flashing with code P0304. I have swapped coil, repaced plugs and wires and no change. I have noticed in the past that the exhaust had a wierd smell I cant say it was rotten eggs and where I park in the driveway there is a black mark in the snow at tail pipe. I had a complete head gasket job a year and half ago.
Thursday, March 7th, 2013 AT 3:26 PM