You have a 05 Silverado AWD LQ9 6.0L VIN in a 04 6.0L LQ4 OS but you said it is a swap vehicle so not sure what you have. What fuel rail and fuel system do you have? Does it have a vacuum referenced regulator on the rail with a return line going back to the tank or is it a dead head fuel rail with no return. And are you trying to run it with open exhaust (open headers)? I can fix your bin for the 8.1L injectors.
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