Hello & Welcome,
Where are you grounding the computer for restart ? case ? terminal ?
I believe you are going to find that you have a faulty FICM (fuel injection control module).To verify this would take the use of a scan tool looking at the data where trying to start engine.
First take a look at this info for a " chafed wiring harness".
09-06-04-034: Malfunction Indicator Lamp (MIL) Illuminated, Fuel Injector Driver Circuit DTCs and Cylinder Bank Shut Down DTCs, Reduced Engine Power (Repair Fuel Injector Control Module (FICM) Harness Chafed Wires) - (Aug 17, 2009)
This condition may be caused by the fuel injector control module (FICM) wiring harness protective conduit rubbing against the back of the alternator, the alternator bracket or the FICM harness retaining bracket. This may result in the conduit rubbing through, exposing the wires inside and chafing of the wire insulation then occurs.
Note: For Silverado and Sierra models only perform Step 5.
Important: DO NOT break off the tab on the electrical connectors.
Note: Some of these chafes are very small, possibly the size of a pen tip, but could still cause injector circuit concerns.
If necessary, peel the tape from the area and look for ANY chafes into the wires.
Note: For Silverado and Sierra models only perform Step 11.