I keep getting a trouble code telling me that my fuel is either running to lean or to rich. I have a aftermarket h-pipe with no cats. Could this be causing the problem? When the car is at a smooth constant speed you can feel a little miss. I appreciate any help.
i had same problem but im misfiring on 3rd cylinder and yeah its studders and stuff around 45 it starts. blows out white smoke like as if i did sea foam but i never have haha. head gaskets i think are my problem.