1994 Chevy Silverado 1500 Problems Need Help

Ok here's the deal the fuel pump went out on it replaced it was running fine now it has a rough idle when you start it and after the coolant gets warm enough for the gauge in the dash to show it, it dies and wont start again. I have replaced the Mass air flow sensor one of the two coolant tempeture sensors the throttle position sensor seems to be fine because it has good accuracy when i throttle it up by hand there is also a donut gasket out on the passenger side by the starter and the inline fuel filter is being changed tonight so if anyone has any ideas on how to fix this please get back to me i'm stuck in the dark on this one Please and Thanks ya'll. I dont wanna play the elimination game with brand new parts, to much money.

the fuel pressure should be measured...

new pump who made it ? most non dephi pumps fail quickly..

also check the fuel pressure leak down ...could be the engine is getting flooded...

remove distributor inspect...plug wires shorting out damaged old ?

when you open the hood and do some testing inspecting then report your findings I'm sure we will have an answer...