Initial start up did not have spark, put jumper wire to ground on coil bank connector after visually inspecting all known connections, engine started ran rough, and got codes P0010, P0107, P 0122, P0222
Prior to the AFM/Dod delete it ran fine and no issues except stuck #4 lifter and slight drop in oil pressure
Did complete delete, PCM reprogrammed (by Brendan Patten from this site, great guy!), new non DOD lifters and GM cam (not high performance) removed oil pan replaced pick up tube O ring, replaced VLOM with cover blocking solenoid ports.
Upon start up no mecanical noises, oil pressure restored, would run about 5-6 seconds roughly and then reduced engine power and shut off. Would have to clear codes to restart.
The delete was performed in vehicle (2011 Tahoe 5.3 LMG), I was careful when moving wiring, disconnecting etc.
Have cleaned grounding strap and hardware and reattached (rear driver's side of block) same on passenger front side of block.
Everything seems to be hinged on a ground issue.
G102 (under exhaust manifold near cyl #3) feels tight and wasn't removed before.
I have looked at countless videos, diagrams and so forth trying to see problem areas others may have experienced with grounds.
Since there was no ground of the coils I tried to find a ground distribution diagram to see if any of the other issues (throttle body/sensor, map sensor ) have a "shared" ground to help isolate the location to reduce searching. I understand things break, I don't think as many issues as I have had all just failed since I began this project. Like many I have limited resources (hence the reason I was doing it myself) so just replacing parts in suspect systems is not my first choice. Been beating myself up on what I could have missed, I believe it will be something relatively simple to fix once found. I am not a mechanic, I am just an old disabled vet trying to fix his truck. Any suggestions would be greatly appreciated.