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My 2000 5.9 keeps missing on Cylinder 4 and the code is sayin it's an open circuit in the injector. (P0204) so I sent the pcm off to the manufacturer and they said they were out of tolerance, fixed it and it's still throwing code and idling super rough. We checked for continuity on both injector wires, and the pcm is working fine. So I disconnected the injector while it was running, nothing changed as I expected. But then I disconnected two more while still running and nothing changed, like I never disconnected them. I had some guesses until that happened. Any one know anything that could cause that? Cause I have no idea.
 

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i would ohm out the wires from the injector connector to the ecm connector to see if the brake is in the harness. also you can swap that injector out for a different cylinder and see if the code follows that injector or not.
 
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