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Hey hoping for some direction so I have Just got done shoving a 2003 5.3 block into a 2004 GTO, to much boost on the original block. I have Spark and plenty of fuel at the rails but no injector pulse. I dont have any power with car in “on” poisition at the injectors. Fuses check out.

2004 GTO Moved all sensors from the original block to the 5.3 block. Please help really stumped. Sorry if already have posted been searching for a week and trying various things.
 
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