Ford F-150 rough engine restart and idle issue when warm after driving on Ford F-150

Some Ford F-150 owners report experiencing rough engine restart and idle issues after driving, which may stem from various factors such as problems with spark plugs, the PCV valve, or vacuum hoses. Additionally, if the check engine light is illuminated, it is advisable to check for OBD II codes to identify the specific issue. Some owners have noted that issues with the fuel volume regulator control circuit can also lead to rough idling once the engine warms up. Diagnosing the problem may involve checking the FPR vacuum line for any gas odor while the engine is idling. Furthermore, timing issues related to the PCM's adjustments through VCT solenoids and phasers can contribute to rough running when the engine is warm. Lastly, a malfunctioning thermostat may cause erratic high idle and stalling, which could temporarily improve after the engine cools down.