Jimmy cranks over, idles until heats up then cuts off. After cooling down, same thing over again.
Changed plug, wires, cap, rotor, pcv, and coil. Checked and cleaned the egr valve. Replaced a broken knock sensor.
I've been looking over youtube... Maybe a bad camshaft sensor?
Where is the crankshaft sensor on a '92 4.3 Vortec?
Fuel pump problem maybe???
Thanks for any guidance!

 

Still acting up...
The TPS, and MAP sensors checked out ok with a volt meter. Replaced the fuel filter. Going to see if I can get a hold of a fuel pressure tester. Acts like it isn't getting any gas at operating temp. She'll turn over with starting fluid...

 

Update... still not right. Fuel pressure was a steady 55-60. No input from anyone...
Can't find anywhere in Chilton's the location of the camshaft position sensor and the crankshaft position sensor. Can anyone please show me where they're located?
Thanks

 

It dies like there is not enough fuel? Try to disconnect pump at idle - will it be the same?
Also, did you check temperature sensor and it's wiring?

Regarding crankshaft and camshaft position sensors.
If your distributor looks like this, camshaft semsor is inside distributor, crankshaft is in front of engine in a plastic cover.