Fixed a 6.7 Powerstroke rough idle in 2 hours after 3 weeks of guessing

Truck came in 3 weeks back with a rough idle and no codes, we threw a fuel filter at it and sent it. Owner brought it back Monday, so I watched live data for 40 minutes and saw cylinder 5 contribution dropping to -4.2 at idle. Swapped a $310 injector and it smooths out on the road test, so what's your go-to check before you start throwing parts at a no-code miss?

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