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I bought the truck it did not run the engine harness was cut so I replaced it.
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Being you bought it without it running; you should test the compression on all cylinders. It could have a mechanical engine problem causing a dead cylinder or cylinders.
A bad IAC can cause starting problems. After the engine is shut off, and before it is started, the IAC should open somewhat. When the engine is cranked, and if the IAC does not open at all the engine will usually “load up” or “flood”.
If the engine ran well after driven down the highway for a few miles, then it would sound like an IAC problem.
If it gets fouled plugs, and makes it into closed loop operation while still misfiring, the system will go very rich because of the constant misfire. When this happens the truck will run better with the oxygen sensor unplugged.
Did you splice wires or just replace harnesses?