1993 GMC Jimmy cranks but wont start

What is the actual fuel pressure reading you have? Also do you have a nice blue spark to all the plugs?Any codes in the computer?

Are you asking at the dealerships? This is the type of vehicle independent shops work on every day.

The parts you replaced are random and all over the place so that suggests you haven't diagnosed anything. That is the least effective and most expensive way to solve a problem. The first thing you have to do is determine if you're missing spark, fuel pressure, or both. That will take a mechanic two minutes with no special tools or testers. If you don't know how to do that, I can walk you through it. You'll need a helper to crank the engine for you.

I am not for sure what the fuel pressure reading is, all the spark plugs are working, the engine light does not come on.

how do you check the fuel pressure

You said all the spark plugs are working do you mean they have a nice blue spark while cranking?To check the fuel pressure you can rent a gauge at auto zone.You just screw it on the fitting on the fuel rail.Then crank the engine And read the pressure.When you say you the engine light doesn't come on do you mean with the key in the run position and engine not running it not on?

When the car quits while u are driving it, the light comes on but as soon as I get it started it goes off. Everyone is telling him that it is the computer but he has tried the computer and that is working.

When it quits running and won't start we need to see if you have spark and what the fuel pressure is.That's where we need to start.