2004 GMC 1500, 4.3

Paw Paw “J”

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I just installed a new long block in my grandsons truck, engine turns over but won’t fire off, first place I checked was voltage to the coil, it’s good, then went to the signal wire and probed it, the led lit up but didn’t look as if to be pulsating. Does the computer need to be reset?
 
Any codes in the computer?
Did you check fuel pressure?
 
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