I have a 99 escalade that seems to have one issue after another. Recently while starting the vehicle it cranks over, starts for a second then dies. Waited a couple hours and tried again and ran perfect for a couple days. Then once again i turned the key it fired up for a second then dies. I recently had the fuel pump replaced, but the vehicle sat for about 4 months. While turning the key to the setting right before starting the vehicle i can hear the fuel pump charging the lines so i believe the pump is still good. I dont know if i have a fuel or spark issue though. No check engine lights or faults appear either. If anyone has some tips i would greatly appreciate the help.