tell me..how much fuel pressure does it have?
58psi is a little weak......i need to know how much pressure it has while turning the starter....
these vortec engines must have no less than 60psi even while turning the starter,,it is very common to get a bad new pump for these.....i think your problem is still the fuel pump
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.