I replaced the injectors with some new ones that I have ordered and the car sounds and performs better. But still at idle it back fires but the car accels better and drive better and I checked the wiring out and it was fine. Someone told me to run each injector straight to the ecu and they said that should solve my problem. the injectors are oem and I didn't get to check out the resistor box but I'll try to get to that because I got another one lying around the house. Would running open header cause the problem as well with the back fire or it shouldn't do that.