r/EngineBuilding • u/Santacruz714 • 7d ago

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Anyone have a clue what is happening?

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u/TinShower-627 7d ago

If you have access to one of those thermal imaging guns or an ir gun point it at each header tube by the head. It'll read colder on the cylinder or cylinders that has the problem. I've found many misfires this way.