Fiat 500X rough idle after prolonged driving when stopping at traffic lights on Fiat 500X

Some Fiat 500X owners report experiencing rough idle after prolonged driving, particularly when stopping at traffic lights. Common causes of this issue include vacuum leaks, which can negatively impact engine performance, and problems with spark plugs that may require inspection and replacement if they are worn. Additionally, faulty ignition coils have been noted to disrupt engine performance and contribute to rough idling. Another potential culprit is a malfunctioning idle air control valve, which can lead to irregular idle speeds or stalling when the vehicle comes to a stop. To resolve these concerns, it is advisable for owners to have a thorough inspection focusing on these critical components.