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Where is iac valve on 2004 ford f150 4.6 v8?

The IAC (Idle Air Control) valve on a 2004 Ford F-150 4.6L V8 is located on the intake manifold, near the throttle body. It's a small, usually cylindrical, valve. You'll likely need to remove some air intake components to see it clearly. A picture or diagram specific to your year and engine would be very helpful in pinpointing it precisely. Consult a repair manual (Haynes or Chilton) or an online parts diagram for your specific vehicle for the best visual aid.