ok, so I have a 96 4 door, 4 wheel drive, s-10 blazer with the 4.3 liter v6, with the 2nd gen spider injectors or cpfi, here's my issue:

.Engine turns over fine
.will fire off of fuel poured into throttle body, or starter fluid but shuts off right away
.fuel pump is good
.fuel filter is new
.fuel pressure is good
.pulled lines off top of injector and have good pressure there too
.no fuel mist or spray inside of throttle body
.starter relay good
.fuel pump relay good
.all fuses good
.crank sensor good

any suggestions? or should i just pull the entire intake and attempt to clean/replace the injectors? I'm pretty well stuck, can't think of what to try next short of pulling the intake and injection system off of another 4.3 and see if it will start

 

That doesn't really tell us too much. In the absence of the pressure numbers, have you read through this post?
96+ Fuel System Diagnosis

 

ok, got a chance to recheck fuel pressure today with two other gauges, apperently I had a bad gauge, only reads between 22-24psi, so I know my pump isn't putting out enough pressure, I have another pump and am going to swap it out to see if that would make any difference in my problem, anything else I should check while at this point?

 

How did the pressure hold once the pump shutoff?

 

pressure stayed at 22-24 psi for about 10 min, then i released the gauge and removed it