My buddy purchased a stock 5.3l harness computer and trans from a 2005 express with P59 computer. Truck engine setup is stock minus headers with no cats and intake tube but stock maf
Keith 1950 Truck stock 5.3l.hptkeith log 1.hpl.
The headers glow red in 2 minutes of running. The idle is high so computer is pulling timing. The swap came with the etc pedal as well which seems to not return to idle smoothly either. No manifold leaks. Any suggestions? Thank you for the help.