5.3 swap runs but dies

ok so got my swap started but bogs down after a few seconds. almost like to runs out of fuel. now i searched and it seems like vats, but my computer and stand alone harness are from nelsons. with no second o2, no vats. i haven't hooked up the tach or speedo yet. but was also thinking the my stock 98 c1500 4.3 fuel pump wasn't strong enough. i will be checking fuel pressure tomorrow. (gotta bring my gauge home from work) oh i also think i might of messed up the o2 sensor wiring. (aftermarket sensors) <~ would that cause that? maybe just second guessing myself .:sigh:
:thanks:

ok so with a little bit of motivation and a beer or to in me, i went outside with a muiltimeter and a couple test leads, made sure it wasn't a ground problem. and what do u know my fuel pump would shut down after a few secs. so i wired it up to a power source and BAM we got a running swap. so it turns out my stock anti-theft system was triggering.

I had the same problem. I sent the PCM to lt1swap in Missouri and they reprogrammed the whole PCM for $75.

Vats needs to be removed from the PCM.