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standalone tbi 454 injectors not firing

755 views 3 replies 3 participants last post by  gregy133 
#1 ·
I pulled the 454 from a 92 gmc 2500 with a manuel trans. I have the whole engine wiring harness with a 1228747 ecm. I am able to crank the engine but can only fire if I spray gas in it. I can just the injectors to fire but the ecm isn't firing them. Any help would be great
 
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