My car still missfires and I dont know whats wrong. It only does it once it warmed and up to operating temp, so could it be my cat? The code that comes up is random missfire and catalyst efficiancy below threshold. I found out my passanger side cat is gutted out so thats whats causing the code. Could a bad cat also cause a missfire. If i getta new cat will it go away? If it doesnt im gonna change EGR and fuel filter and see if that works. Gear chatter said it has something to do with the crankshaft sensor, so i really hope its nothing major.
