lose power after warm up

I have a 93 s-10 blazer with the vortech motor. When you 1st start it up it runs & drives great. Then after it gets hot it stalls , hard to get running again. I,ve replaced tons of stuff, complete tuneup- wires,plugs, cap, rotor,ignition module, coil, fuelpump,fuel pressure regulator,fuel lines, even had the bottom end of the motor rebuilt. I'm starting to pull what little hair I have out. If anyone knows or could point me in the right direction that would be awesome

When it quits check for lose of spark and fuel pressure.
Also check engine vacuum at idle and at 2K rpm.
If vacuum at 2K is under idle vacuum reading you have a restricted exhaust system.
If lose of spark check ign module and ign coil.
Let us know what these test say.

thanks for the info , and I'll check that out