you need to check a few things when it wont start,,,first,check to make sure you have a spark on the plugs..a bad rotor ,cap or ignition module may give a fit sometimes..also,you may want to try starting fluid,,,these vortec engine must have 60 psi at all times,,,yours is on the borderline with the 58psi...the pump is a little weak
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Test Description The numbers below refer to the step numbers on the diagnostic table.
Notice: Do not allow the fuel pressure to exceed 517 kPa (75 psi). Excessive pressure may damage the fuel pressure regulator.
The Vehicle Control Module(VCM has integrated IC circuits that are fault protected; therefore, if a circuit has failed, the integrated IC may not be damaged. If that is the case, the IC will keep the circuit open until the fault in the circuit has been corrected.When the fault has been corrected, reinstall the VCM and check the circuit. Replace the VCM only if the circuit is still inoperative.Test Description The numbers below refer to the step numbers on the diagnostic tables.