stumped with 4.3 spider assembley, help!!!

[scoutout]

I have read through several of the threads on this, but am still stumped. 93 GMC Jimmy, 4x4, 4.3 vortec. Died going down the hiway. Have replaced fuel pump, fuel filter,all lines, etc., the spider assembley with fuel regulator, twice, thinking maybe the first spider was bad.
Also inspected fuel pump pulsator lines for any ruptures. Replaced hard plastic lines that mount to the spider injector. Virtually everything in entire fuel system is new.

Getting fuel up to the assembley with 55-64 psi. But still no spray out of the injectors. Do have injector pulse, or ignition spark. Can pour fuel into the intake and it will start and run until fuel is burned up, then dies. Have spent hundreds... still wont run.

Took it to GM dealer for diagnostics, they can't find whats wrong either, without manually teariing into the system as well as my wallet. Totally stumped, mechanics I talk to are stumped. Any one have any advice? Much appreciated, getting totally frustrated.

Thanks !

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[MT-2500]

Are you checking injector pulse at the injector unit or at pcm or outside of plamtuim.
I have had several of them the injector wiring from where it goes into plamtuim to injectors get bad or broken.
If you have fuel pressure and injector pulse outside plamtium. remove plamtuim and see if it is getting pulse to/or at injector unit and make sure injector unit is working and getting power to one side.
But one word of caution disable ing. coil before cranking the engine with plamtuim off or it will self destruct real fast.
MT