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Old 11-11-2021, 09:14 AM   #1
Monte Howard
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Default 2001 gmc 8.1 ECM upgrade question
I have a 2001 GMC 2500 HD, the ECM isn’t sending a pulse signal to the #4 injector. So I need to purchase a new ECM I am assuming. Anyone have experience upgrading the ECM on these 8.1 chevys for more performance for towing?
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