My truck just shuts off ?

I have a 2002 Chevy Silverado 4.3 l 5
speedafter the truck sets a while it will start
and run fine but as soon as it gets warm it
loses fuel and the truck shuts off just like I
turned the key off I have replaced the fuel
pump ignition module and I've had no luck
truck continues to do the same thing when it
starts it runs fine it takes throttle fine has no
issues whatsoever if I sit with my foot on the
throttle at about 3,000 RPMs it will run fine
then out of nowhere shut off like I turn the
ignition off I have good spark but low fuel
pressure pump is brand new but seems to run
intermittent.