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Where is IAC valve on 1989 Ford F150 5.0 V8?

The IAC (Idle Air Control) valve on a 1989 Ford F150 5.0L V8 is located on the throttle body. It's a small, usually black, electrically controlled valve mounted directly to the throttle body itself. You'll find the throttle body on the intake manifold, typically near the firewall. It's a relatively easy part to spot once you've located the throttle body.