1988 z24

help me please before i burn this car. My 1988 z24 started dieing after running for about 25 minutes then would start and run for a couple of miles then dye then start again then same thing dye out, finally it would only start and idle (roughly). Fuel pump was making a real loud grumbiling noise so changed fuel pump( a cheap ebay one) fuel filter, and fuel sock. It then started ran fine for about 5 minutes then every time i stepped on the gas it would die. Checked all the relays they were fine,cleaned throttle body,same thing starts then wont accelorate then dies. If you hold the key in start it and pedal down it seems to run. If you turn everything on electrical it runs a little better still very very rough.Does not seem to be getting enough fuel maybe???? Brad