Where is the Idle Air Control Valve located on a 2001 F150 4.6 Ltr?

The Idle Air Control (IAC) valve on a 2001 Ford F-150 with a 4.6L engine is located on the throttle body. It's a small, usually cylindrical, valve mounted directly to the throttle body itself. You'll find the throttle body on the intake manifold, near the engine's front. It's a relatively easy part to spot once you're looking at the throttle body – it's usually fairly obvious once you see the throttle body.