I have an 89 s15 jimmy I started it the other day and it barely idle I turned it off to check a few things and that was the last time it started. It cranks and has spark , but the injectors will not fire. the timing was good the last time I drove it. It has a new fuel pump, rebuilt throttle body, new fuel filter, new oil pressure switch, new icm, the pump relay is good and there are no blown fuses. I checked the fuel pressure and it was in the acceptable range there is fuel getting to the throttle body but that's it, I did not see any frayed wires either. Any suggestions would be appreciated.