trying to post this on LS Swap page

[1986brownjl]

Tried to post on lsx swap page but I can't find a "New Thread" button anywhere. But I having a problem with 2003 5.3 motor that I'm swapping into 85 k10. I'm trying to start the motor and let it run for a minute before installing it into the truck. I sent the PCM to brendan at lt1swap to flash it. Once I got it back I plugged in the wire harness and wired up the starter and PCM. And made sure all the ground wire are grounded. The engine will fire up for a split second then shut off. Anybody have idea what this might be or how to post on the lsx swap page. Thanks