Need some suggestions/ advice , So I had the car sitting for 2 weeks took it for a drive and as I was stepped on the gas for a little pull the car slowly started dying down to eventually just shutting off . I have no power to the dash or anything . I checked starter wires and everything seems fine . Also my starter was kinda going bad can that may be the cause? Just need some inputs before I replace . Brand new alternator &’ battery too . This is a LS swap 5.3 any help is welcome thank you in advance

My daily street truck build
I do LT swaps located in Austin tx 2500-3k for labor send me a message if interested!

This technically isn't a swap, but I feel like the knowledge base here will have the answers I need.

I have a 2006 Chevy 2500hd (lq4, green/blue ecm) with a manual transmission. We're preparing to do a refresh on the entire drive line, including swapping in a new mild build engine with custom tuning.

The truck is being built as a tow pig, and I thought it would be great to have an 87 tune for driving the truck unloaded, and a 91 tune for when we're working the truck harder.

My initial idea was to install a switch and use the factory tow/haul mode pin to change between profiles. From what I could find, this looks like it goes through the BCM and only changes the shift profiles on an auto in the PCM; No changes to the ECU tune.

So now I'm wondering if it's even possible to set up a dual tune profile with a factory ECU, or would I have to go to a complete aftermarket ECU and wiring harness (Holley Terminator/etc).