All sorts of things

Maintenance/Repairs
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1

Vehicle: 2000 F150 V6 4.2, 2WD, manual transmission

Issue: High Idle when in neutral and pulls in 1st and Second
Weird things: when in neutral at a stop, if I depress the clutch all the way to the floor the high idle will go away in a few seconds. Once released the idle stays relatively low. Then once engaged and driven through the gears and coming to a stop again the high idle returns.

Any thoughts?

2

Idle air control (IAC) motor is my first thought. On the throttle body, controls idle. Easy and cheap to replace.

May also be a vacuum leak that changes with the force placed on the engine when the clutch is depressed. Could be hard to find.

3

I changed the IAC. It ran smooth for a few months then went back to the high idle.

Collin Slater