so i just put an engine and tpi in my truck and now it just doesnt have uummph(overrevvs when i try to go, but it will cruise around 15-20) it could be so many factors... heres a video.. click on the photo to see video.[/IMG] heres are my specs: (2004) 350 crate motor(it drove/performed well in another truck right before i took it out and put it in my truck.) tpi parts here and there mainly 86-87 90-92 camaro harness with computer reprogrammed th350 torque converter summit #g2700 i think has 1800 stall (tech guy said it would be fine) theres are no trouble codes before or after driving it around the block(15+ min.running). i know i have an exhaust leak. i think i have it idling a little too high not sure if there is the sound of a nonfiring cylinder it sounds like the iac is always open so that could be it right there. I couldnt see/hear any vacuum leaks on my lines. i then replaced the modulator, still wierd then replaced the vacuum lines coming off steel mod lines with even more robust fuel lines(same i.d. but bigger o.d.)and still wierd I originally had it hooked up so that the modulator vacuum was tied into the throttle body(underneath) but that didnt work, so i tied it into the brake booster line as a last resort. my torq. cnvtr is in right(had to pull it forward to meet up with flex plate) and put fluid in it before hand. i have the right amount of fluids in everything..tranny motor and transfercase(except for coolant.. theres still an air bubble in the system i have to address) i dont think it's the tranny. my truck rode fine before the swap. I'm still pointing to vacuum leak. i guess i should check for compression(would a broken piston ring make it have no power?) tps is set timing is set fuel pressure is set i have more than half a tank. i'm still new to engine swaps in general(this was my first ) so any info would help.