LTX and LSXPutting LT1's, LS1's, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects, including repairs, swap info, and performance upgrades.
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Those words sound so familiar. Anyways, I figured out what I thought was the last of my issues today. (I had the coil signal wires ran to the wrong bank of cylinders...).
The motor is an '02 lm7; ls6 manifold/rails/injectors and the stainless works headers. It cranks fine and fires almost instantaneously now. However, as soon as it fires, it backfires and dies. I haven't hooked a 'noid light to my injectors but the plugs are getting wet and I have ~60psi off the rail at all times. My scanner shows an rpm signal(so I would presume good crank position sensor?), fairly accurate IAT and CTS temps, injector pulse width values and shows outputs from the o2s. Motor HAD bad grounds but I have added three more. The PCM is a red/blue from '02 truck that I had Vince @ Trifecta Performance flash with MAF, rear o2 and VATS delete and told him about the ls6 intake and injectors.
Help me out guys, where do I go from here?
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__________________ 91 trans am vertcardomain
LSx - T56 - Fun
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Honestly that was my first thought as well, but Trifecta has done a significant number of tunes with others without hiccups before... Maybe I'll call him tomorrow to see what he says.
No codes whatsoever. And a no on the second ECM. I bought it brand new from my work and now we don't stock them. hehe.
Well. Figured it out. I guess you could say it WAS programing. Emailed Vince and he said he double checked his logs and they say he deleted VATS. He also suggested that usually swaps like this (that he has delt with) do this when something it messed up with the MAF. Which startled me because I asked to have the MAF tuned out and run a MAP only tune so I had NO MAF or maf wiring. Picked up a brand new MAF from work, applied power to the MAF and signal to the PCM and it fires up no problem now. Holy crap is it loud. Side dump exhaust with no muffler inside a tiny garage. I'm happy. Tonight I'll dump coolant in it and hook up the last brake line and try to take it for a spin!
I'm happy. Tonight I'll dump coolant in it and hook up the last brake line and try to take it for a spin! 
