So I just bought a 2000 gmc k2500 with 100,000 miles (5.7). When I first went to look at it the guy said it’s been sitting for over an year he got it to start and it ran ok it stumbled bogged down would not accelerate. So I took a chance on it and bought it anyway came back with my trailer and it would not start after cranking on it awhile it did and ran pretty good. Got it back home and now it just cranks no start. It has good fuel pressure 60 psi koeo and drops to about 55 while cranking. It has spark runs good on starting fluid. No codes. So I took my test light to the pink wires on the fuel injector harness and they all have 12v power but I’m not getting the impulse on the other wires while trying to crank? Thank in advance.

 

Same issue with my lumina (96). ECM was replaced, that was 3 years ago.

 

Tried a junkyard pcm still no pulse.

 

ECM
Not pcm