1989 Chevy Camaro difficult to start once hot

Engine Mechanical problem
1989 Chevy Camaro V8 Two Wheel Drive Automatic

I rebuilt a 1989 Camaro, 350, TPI. It will only start with remote switch, not from key. It starts great on second try, never on first. But I keep getting stranded, not ever time, but once hot, It cranks and has spark, but will not run. If I let it sit for a while, up to one Hr. It starts right up again.

Thanks for your help