Injector gone BAD?

If your ok with diagrams you could do check for opens or shorts. This will be X2 of the IDM. If your ECM/IDM looks different, let me know what year your truck is and I will try again.

[SIZE=+1]Injector Cylinder 4 [/SIZE] Test Point

X2-1 to X2-21 spec 0.7 Ω to 1.5 Ω
If > 1.5 Ω, check for open or high resistance between IDM and injector, or open injector coil

X2-1 to gnd, X2-21 to gnd spec > 1 kΩ
If < 1 k&#8486;, check for short to ground in harness or injector coil. Disconnect injector and retest. If > 1 k&#8486;, the short is in the injector.

X2-5 to X2-22 spec 0.7 &#8486; to 1.5 &#8486;
If > 1.5 &#8486;, check for open or high resistance between IDM and injector, or open injector coil

X2-5 to gnd, X2-22 to gnd spec > 1 k&#8486;
If < 1 k&#8486;, check for short to ground in harness or injector coil. Disconnect injector and retest. If > 1 k&#8486;, the short is in the injector.

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Sounds like the injector has failed , over fueling. We just replace them . Because the internal failed and let too much fuel in at idle and underpaid.