2016 Chevrolet 3500 LML

[Luggz]

Hey guy's, Well I'm new to the forums, based in South Carolina I own a Diesel repair and performce shop. I have used many EFILive devices in the past and current. I am currently having a issue with a vehicle im my shop. I was hoping I could get some insite on this current issue.

I have a 2016 Chevrolet 3500 high country with 339k miles on it the owner has taken very well of this truck I have been working on it and servicing it for 3 years for him. A few months ago he dropped it off said it was running bad and skipping. I discovered it had a hole in the number 1 piston looked to be melted also. So we installed a Long block, whole new fuel system, BD Power diesel 64mm screamer, Banks welded charge air cooler with bigger pipes. (It was already tuned before it came to me.) Programmed the IQA codes, confirmed the IQA codes with GDS2 programmed them to GPCM and reset fuel learned values, went for a test drive and im feeling a shutter at 45-70 mph only when you load the engine in 5th gear. I get random injector balance and timing codes some times it may be 1,4,5 other times it will be 6,3,8,5 then again it will be 2,8,6,3 or 1,4 or 6,8 its random they are exceed learing limint injection timing and injection balance.

P02D9, P02D3, P02D7, P01D8, P01D2, P0263, P01D6, P0281, P0272, P0278

when TCC is in this happens see attached..

https://imgur.com/rzgZNTs
https://imgur.com/U5u6SA1
https://imgur.com/8Bcn3VK

The long block and fuel system came from jasper engines, I called tech support they are telling me that the TCC can cause the crank to feel that torque converter locking up and shuddering which in return could cause the injector codes. When I went back and test drove the truck I commanded the TCC off while the truck was shuddering and the shuddering went away. If i drive under 45-60 with no load I dont get the injector codes.

What I have done?

Retuned engine

Overlayed all injector circuits to each injector, changed IQA codes for giggles, changed MAP changed MAF, Truck has a air dog fuel pump has good flow and 10-12 psi supplied to the pump on the engine, timing it set CP4 pump gear dont between cam gear dots.

Can a locking or slipping converter cause random injector balance codes under a load in 5th gear between 45-70?? it's a new one to me

Any help would be grateful!!!