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I have a 2001 silverado had a 4.8 changed the 4.8 to a 5.3 also used the 5.3 harness and ecu, want start; turns over fire it's like it fires off and dies, any help would be awesome.


   
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Location: Oregon
you didn't need to change the pcm and harness.

your going to need to go to the basics. check fuel pressure, injector pulse and spark. Is your passlock working correctly? if your truck uses anti-theft you will might need to do a relearn.


   
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