Throttle body issues truck limp mode

How’s it going. I’m looking for someone to help me chase down an electric short or a wire that’s not totally secured. I’ve got a built 3rd gen that I plan to race next year. It performs great through high speed whoops. But when I go slowly down through a g out or brake slowly or flex the truck out weird it’ll just go into limp mode. The codes I’ve been getting are p505,p2103,p2111. I’ve already replaced the throttle body and alternator with no luck. Alternator is charging battery and staying consistently around 13.4-14.2 volts. I already had a buddy back in Colorado test the throttle body harness and he did mention it was tripping out and getting faulty signal. I don’t know shit about electronics really. If anyone out hear closer to St. George Utah could help me run through these harnesses with a volt meter would be greatly appreciated. Am willing to drive a few hours with the truck on my trailer. Every time it happens I let the truck sit with battery disconnected for 5min and it seems to go away. I did cut out my wheel wells to cycle al the up travel, before I did that it never had this problem. I just know I must’ve pulled a wire loose or snagged something. Again I live out in St. George Utah and really hoping to bring the truck out to hammers and of January here. My names James btw.

 

Here’s some pics of the cage I built. After I did this is when it all started.