Looking for some help as I’ve run into a dead end. Car ran great had fast 102, ls9 injectors, and fuel pump thrown in. Tuned to speed density. I get car back make a pass it doesn’t wanna run turns out loose wire in fuel pump but does finally make a faster pass. After I find and fix wire I drive car around it wants to die when I get to stop light. It’s running rich/lean randomly. Do a wide open pull find out it’s jumping from 11.3-12.8. Getting 10mpg. Idle is 13’s low 14’s. I’ve done leak down test, smoke leak test, fuel pressure is 61, checked coils, swapped iat sensors, new plugs, etc. no codes, my short fuel trim
goes like -25 sometimes. Can’t figure it out

 

What CAM is in it?

Trims float on one bank or both?

Fuel pressure solid while idling AND driving?

I can somewhat see a situation where a "bad" wire was previously giving too low voltage to the pump, and your fix is now making more fuel causing rich, but that should trim out and stabilize at idle.

If AFR is floating around and pressure is solid/stable that makes me think an injector or O2 sensor is acting up but that'd likely show in one bank not both. O2 sensor also wouldn't affect WOT instability on a stock computer.

Is MAP stable and accurate? KOEO it should read atmosphere pressure.