I just installed another engine in my g20 and it runs and idles good for about 5 minutes then it starts to bog down and die. I was thinking a loose vacuum hose or something but maybe its the tps. engine has over 200k. If anyone can help, I would really appreciate it.

i should also say that the engine was a 5 speed and i changed it to auto. So maybe I need to switch some stuff over. Would the iacv need to be switched? any help would be very appreciated. thnx.

Check the ECU for error codes.