I finally got time to dig into it today. After running on high idle for 3-4 minutes I checked headder temps with IR heat gun right at the head. #1 259, #2 248, #3 290, #4 220, #5 165, #6 415, #7 95, #8 301. So #7 is for sure dead, I swapped plugs with #5 and no change. I swapped wires with #5...