I have saved a cranking data log and trigger scope, with fuel pump relay removed and the engine is firing and trying to run, sounds like if I fit fuel relay it will run.
I will check shields are connected.
This is a fresh install LS1 in Porsche 944T running same G4+ and had no issues with Porsche turbo motor.
Dyno tuned with no problems, test day at track no problem, issues started at first race meeting, and have gradually got worse.