Previous OTHER service company said they performed an injector driver inspection, stated did not find anything wrong but talked me into buying upgraded performance tune.
It sat on my shelf for a year as i pulled the engine for a rebuilt and just recently reinstalled and tried to fire up on 8-13-23. Found out when key on not running driver side bank of injectors open up continually spray fuel, flooding cylinders with fuel, appears driver side injector driver may be grounded out turning them on as soon as ken "on''
Eliminated all other possibilities as have replaced with 3 sets of injectors no change in results, 2 sets of new distributor and coil assemblies no change in results, continuity and resistance test of injector harness, no faults found.
That is very common on those ECMs after bad injectors or bad grounds. I have a few videos working and successfully repair them. Not always possible due to board design