k10crazy

So I put a 5.3 into my 86 k10 I used a psi harness But im having trouble getting it to run correctly. It fires up and idles around 1100 but when you go to hit the throttle it falls on its face. Seems to be a vacuum leak but I cant find one. Also if I used a pcm out of a fly by wire tb vehicle can I still use a cable tb? Any info on what I should check will be appreciated

Garrett Shaver

I'm pretty sure a retune is required when swapping tb setups. Good luck with the swap!