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It needs at least 60psi fuel pressue to start. You need to check fuel pressure with a gauge. If the dist cap or rotor is bad, the spark will not be on the right plug at the right time. Same goes for a faulty distributor or a problem with the timing chain. And the ignition module. Also check the ecm for trouble codes.
Check the plug wire from the ignition coil to the distributor cap. If you haven't already, replace the distributor cap and rotor. The GM Vortec's have issues with moisture getting inside the cap and rotor and causing problems.
Check the wireing to the pump they had problems with it it tended to over heat and corroad there is a service bulliton on the prroblem #25215705and a kit with new wires and connector to resist over heating Icould give you the kit # but i got a DELPHI pump and the connector dosn;t fit a chevy pump
I would definately check around the intake gaskets with any spray lubricant or cleaner.Do this while the engine is running. If it starts to stumble then concentrate the spray until you pinpoint the area of fault. This is all I have to offer without being there. Good luck,Dana