hey guys, I have a 70 c10 I just put an lq4 in. it has a cam, long tubes, and typical supporting mods. I'm running an aeromotive fuel pump and bypass regulator into FAST fuel rails. the PCM has been tuned by Nelson. the problem is, it starts, but dies after 2 or 3 seconds. I was hoping someone could help diagnose this or point me in a direction. thanks in advance