I have a 98 Chevy Silverado 5.7 that wont start!?

[SteveN]

It will start initially and die immediately. I have changed the pump, ignition switch, filters, and relay switch with no avail. I then started doing some electrical checking and found I have no power to the injectors. I swapped the computer out twice with used computers, one from a 98 gmc with same engine, and then from another silverado. The GMC model made it run and I had power to the injectors, but it was out of time, while the other silverado one did the exact same thing. So is the problem with the computer? Can I have the computer just reset and it work? or is there another problem? Im lost, since everything points to it but it is discouraging when you keep swapping it out and it doesnt work, esp when you are tight on money. Thanks any help would be greatly appreciated.

Oh yeah, could it be something with the security system? The light comes on every once in awhile. not everytime tho, it has a after market radio that looks like it was unprofessionally installed, looking at wires in back.

 

[Ricky Men]

might be a crank shaft sensor or something, could be in your ignition switch, needs to be looked at by a dealer, no average mechanic can fix those kinds of things.