I rebuilt my 5.3l in my 2002 Silverado. I will attach my last scan, my last edit and my Cam card. I need help. Truck runs good sometimes, other times it idles rough. Had some backfires on his last scan. Basically installed new cam, bored the cylinders .40 over and enlarged my intake valves to 2.11in. Everything else on the motor is stock.02 Silverado Idle.hpt11282022 1300.hpl