Well first of all I have been trying to figure this out for the last few days with no luck so I figured I would give this a try and see if I could pick someone elses brain. I went to leave for work monday morning and my tahoe wouldnt start I tried again and it started but ran like cheese so I shut it off and tried again it started and ran ok so I shut it off again and thats the last time it started it will turn over but no fire, untill yesterday after ohming all the ground wires under the hood to the bcm I found no break or bad wire the only way i can get it started is if I run a ground off the body to the post on the pwr/trn relay because when I turn the vehicle on It doesnt trip resulting in no power to the injectors or coils I have good grounds into the fuse panel good ground to the bcm but i cannot figure out what to do next any help would be greatly appreciated.

did you checking the ground pin on the relay socket to see if the pcm ground is getting there? also sometimes those connectors that the relay plugs into get loose and you have to tighten them up with a little screwdriver. im kind of assuming you tried swapping the relay with a different one to see if the relay is the issue

Thanks jwfirebird you sent me down the right path it was the ground from the pcm to the relay it would ohm through but if you moved the wire around it would lose it so its replaced and its back up and running at least untill I pulled my boat to the river with it and I had one of the AFM lifters broke and now Im in the process of putting new lifters in it but thanks again.

thanks for posting the fix, glad to hear you got it