well i installed my headers last year and threw a code. well i finally got the car scanned, P0300A and P0400B, (might be 300B & 400A). anyway there's a misfire and egr malfunction. for the misfire, it has to be a plug wire right? i have a set of otvc wires and looms im gonna start to put on now, if thats not it could it be a plug? and i have no idea what to do about the egr malfunction, should i maybe just get it programmed out and block it off?? my headers have the AIR and egr fittings and there connected. i need to try and fix this so i can send the pcm out to get programmed. thanks for all the help.