Where is the idle air control valve located on a 2005 F150 5.4?

On a 2005 Ford F-150 with the 5.4L engine, the Idle Air Control (IAC) valve is located on the throttle body. It's a small, usually cylindrical, valve mounted directly on the throttle body itself. You'll need to look closely at the throttle body; the IAC valve is often found on the side or even the top, depending on the specific configuration of your throttle body. It's usually connected by a wiring harness and sometimes a vacuum line.