5.7L hemi #6 Cylinder misfire

My Brothers 09 Ram 1500 Hemi just had the same issue on a #7 Cylinder misfire. We changed valve springs, plugs and swapped injectors and it would always come up on the #7. Ended up being a cam. The lobe got wiped out from a lifter that was rotating in the lifter bore and eventually ate the cam... New Cam and now it runs fantastic!