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I wrecked my 2004.5 g35 and bought a clean shell and then I put the motor from my old g into the new g which is a 2003. Turns out the 2003s use narrow band sensors and 2004.5's use wideband o2 sensors. Right now my car is misfiring really bad, I tried swapping ecu but I couldn't get around the nats ( had many people try to program) if it keeps misfiring im going to eventually blow my motor and it's my daily and I'm 17 and live 45 min from work and there are no busses. The ecu in my new g35 is a 2003 and it's trying to recognize the o2 sensors and it will correct itself and it will stop misfiring for about 10 secs then go back to misfiring. Nobody knows what to do I've talked to many shops and no luck. Thankyouuu
 
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