'06 F250 P0275 DTC!
Ok, I just got done with a head gasket swap on a '06 F250 6.0. I took my sweet *** time on it and made sure it was done correctly. I started the truck and let it run for a few minutes. I checked all gauges, and everything appeared fine. However the truck was idling a little rough. I checked the edge programmer for DTC's and a P0275 (Cylinder 5 Contribution/Balance Fault). I let the truck run for about 20 minutes straight, and now there is a very loud "popping" sound coming from the air-intake side. I have checked the injector connection so far and glo plug wiring, its good. Any ideas on what it could be? Thank ya'll for your time.