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We have done a lot of diagnostics on this truck and have determined that the wire harness, C138 is the culprit. Does anyone know how to diagnose issues with the harness (intermittent wait to start when tightening) and truck will start intermittently but not stay running after pressing gas pedal.

We have replaced the camshaft position sensor, the fuel heater and the PCM. All fuses are good.
 

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Welcome to the Nation.

Been using the "throw money at it diagnostics method" I see.

Use a multimeter to check the harness. Remove harness, test between pins.
 
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