1986 Astro van runs then stalls

I have a 1986 astro van
v6 with over a hunderd thousand miles
it starts and runs for about five minutes then shuts off
if I wait an Hour it restarts
Iv'e replaced the ignition modual, rotor and cap, and the coil.
when I turn the key after it stalls the pump comes on for 2 seconds like its supposed to but does not start

doesn't seem to be getting any spark after it stalls

any help is appreciated

thank you