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    Misfire Cylinder 3 and PO200 Codes

    Hi I have a 2002 GMC Yukon 1500 SLT. Car was throwing a misfire on cylinder 3 for awhile, I replaced the fuel injector and that cleared the problem up for about six months. Now the same problem and code is appearing again and I am also getting a PO200 code as well. I can't believe the fuel...

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