K1500 Starts then dies

98 Cheyenne 5.0 V8 cranks,starts for 2
seconds then dies. I’ve figured it its either a
electrical problem or a fuel problem. When I
crank it over and start it for a second it wont
let me give it gas, though when fuel is poured
down the TBI it will let me give it gas. The
Security light is stayed on but thats because
I’ve had the same problem before and
bypassed it, though it was flashing that time.

Heres what I’ve tried
- FP Relay
- All new fuzes/relay
- Inspect security board- no burn marks
- Vacuumed fuel lines
- New MAF sensor


I’m really stuck here. I tried just about
everything else on forums that was
suggested but no luck