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Ran into a debacle the last few days.
I took the truck out for it’s initial shakedown run and when I returned I couldn’t help but notice #4 cylinder didn’t have the same color on the primariy as the other 7. It still looked new, and definitely not the “bronzed” coloring that stainless turns when it’s been heat cycled. This started the troubleshooting.
Swapped coils - no change
Swapped plug wires - no change
Spark test - spark confirmed
I ended up doing a compression check on cylinders #2 and #4 for comparison......
#2 - 160psi
#4 - 165psi
So now I can breathe easy knowing it’s either spark or fuel.
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