* Vacuum leaks: A vacuum leak can cause the engine to run lean, which can lead to low idle speed and rough running.
* Fuel injector problems: If one or more of your fuel injectors is not working properly, it can cause the engine to run rough and idle low.
* Spark plug problems: Worn or fouled spark plugs can cause the engine to misfire, which can lead to low idle speed and rough running.
* Idle air control valve problems: The idle air control valve regulates the amount of air that enters the engine at idle. If this valve is not working properly, it can cause the engine to idle low or stall.
* Throttle body problems: The throttle body controls the amount of air that flows into the engine. If the throttle body is dirty or damaged, it can cause the engine to idle low or stall.
If you are experiencing a low idle speed and rough running, it is important to have your car diagnosed by a qualified mechanic to determine the cause of the problem.
