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I have a 97 jimmy 4.3. Was driving to work and it died, wouldn't start again. I was on the 2nd fuel pump already. So, here's where I am: put in new fuel pump, new filter, new pressure regulator. Tested injectors, all OHM to spec. It will start on starting fluid. Has 60 PSI at the fuel peckcock. Have a relay on order. Is there anything other than the ECM it could be???? I'm stumped.
 

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Well, if it starts on fluid, it's a fuel problem.

If you have the same problem with 2 pumps, it can't be the pump, if you have 60 at the engine, the pump, wiring and relay must be good.

'97 engines came in single point injection and in multi point injection, which one do you have?
 

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Are you able to get a scan tool and look at data? I would try to see if your getting a reading from your crank or cam position sensors. It may be that the ECM isn't getting a signal from them to fire the injectors.
 
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