Good evening,
Can you test the fuel pressure to see if the pressure is correct?
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Does it have a spark to the plugs?
https://www.2carpros.com/articles/how-to-test-an-ignition-system
Did you verify compression?
https://www.2carpros.com/articles/how-to-test-engine-compression
As far as the battery, I would replace that. Low voltage will cause all kinds of issues. You need to start with a fresh battery.
The 2 wire is for the intake air temp sensor. The colors match for that connector.
The other, the purple wires are the key. They are usually for the starting circuit. Is that inside the truck? What is the component below it with no connector?
I attached wiring diagrams for all the components under the hood. You can view those diagrams for the color of the wires.
Roy
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Thursday, January 23rd, 2020 AT 5:15 PM