A Ford F-150 may idle rough and then stall due to several issues, including a dirty or failing idle air control valve, which regulates airflow during idling. Additionally, problems with the fuel system, such as a clogged fuel filter or failing fuel pump, can restrict fuel delivery, causing rough idling and stalling. Ignition system issues, like worn spark plugs or faulty ignition coils, may also contribute to poor engine performance. Finally, vacuum leaks can disrupt the air-fuel mixture, leading to unstable idling.
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