Help! Stalling

[Gold 84]

Lately my 84 vette would start from cold fine, but after about 10 to 15 minutes on the road it will die. It would crank but would not start. It seems as if it is not getting fuel because if I pour fuel in the carb it will start for a short time.
It is a crossfire injection which was serviced lately; fuel pump and filter replace and fuel pressure check out OK.

Any suggestions

thanks