Cranks but won't start

[that black chev]

Do you have power to the injectors? That's a pretty quick and simple check. They should be fed 12v whenever the key is on. The computer switches the grounds to cycle them.

I'll check to make sure I have full power to them

 

[sneakingfart]

If you have a harbor freight near you, they have fuel pressure testers that are not expensive. Or Amazon. Approach this systematically. Fuel pressure bad? You have your answer. Otherwise check power to injectors. And so on. Because otherwise we're just guessing.

 

[that black chev]

Okay, I'll go get a pressure tester and that right after work and see

 

[Schurkey]

Or go to a parts-store and get a fuel pressure tester from their "loaner-tool" program, and pay nothing.

 

[that black chev]

Do you have power to the injectors? That's a pretty quick and simple check. They should be fed 12v whenever the key is on. The computer switches the grounds to cycle them.

I'll double check that when I get home

 

[sneakingfart]

One other thing that comes to mind. We have been neglecting the spark component of this, because we are assuming you have spark based on what you said earlier. But do you have spark on all 8 cylinders? And out of curiosity, your new plugs, how do they look? Are they wet by any chance?

 

[cplanubis]

the tbi's or notorious for the ignition control module going bad.
just keep that in mind even if you do have spark

 

[Billingstitan]

Before you go the fuel route, check your spark from plugs to distributor

Bet you a six-pack it’s somewhere in your ignition components

I dunno why, but our earlier model gmt’s seem to eat ignitions—usually the ICM, but mine’s gone through a coil & two distributors over ten years or so (granted, it was not maintained at all when I got it)

Cleaning all that up & doing the big three narrows it down quickly

 

[thinger2]

Are the injectors actually spraying fuel at all?
Have you checked the injector pulse fuse?
It is always worth replaceing the injector pigtails.
They get very brittle when they are old and it is just a bad location to have a wire pop loose and have a spark happen.