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If the cylinders are not firing, you would not have similar temps at the header compared to the others. Didn’t you say you have compression, spark, fuel, AND exhausts temp?
 

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The injector is only telling you if they are electronically grounding. Not necessarily spray pattern if there is a clog. If it is fuel injector you can move them and the problem will follow.

That is how I found my issue 2 years ago. I had an injector that was not spraying properly.
 
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