nfuentes

My 1988 corvette is having a difficult time starting, sometimes wont turn on at all and here and there stalls out on me while driving leaving me stranded until it decides to start. It does crank but wont turn over when this occurs. I have checked my fuel pressure while i have it running and it is running on 37ish PSI which i know is going to be a fuel delivery issue. I do not know what could cause this. Can anyone help?
Things i have replaced
-fuel pressure regulator
-fuel pump
-fuel filter
Ignition
-spark plugs
-spark plug wires
-distributor
-coil
-rotor
-dist.cap
-new battery