Hello, I decided my old jeep would be better with a 5.3 vortec out of a 2004 yukon. I pulled the 4l60e with it and married it to an np241c transfer case. I finally worked out all the major things with shoving an ls into a car that wasn't meant to have it. The thing runs, idling higher than I would like, but it runs. I took her on her maiden voyage up the street today and that's where the problem(s?) arose.

When I hit the gas it sort of does nothing. It gets a little louder and probably revs higher (tach not hooked up yet), but doesn't accelerate. Because its running so high, I was going about 20mph without pressing the pedal. Obviously I need it tuned but I'm thinking there may be a leak/tps/map/iac issue.

Has anyone else run into a similar issue with the lack of acceleration? Any ideas would be appreciated.

Thank you