Hi there,
You gave a general question, but we need it more specific. Please describe if you are experiencing low or high idling with your vehicle. Is your engine shaking and rough while the vehicle is stationary? Is the idle speed above 10,000 rpm or below 500 rpm? Does the issue happen all the time, or only on certain conditions, such as a warm engine, cold engine, or when the A/C is on (or vehicle is going uphill)?
Still, here are several causes of your car having idling issues:
1. Dirty or faulty idle air control valve. Dirty or bad IACV will cause high or low idle sine the valve regulates air bypass during idle. 2. Vacuum leaks. Gaskets leaks or punctured hoses on the air intake system. 3. Defective throttle position sensor. If faulty, it may send wrong info to the ECU which would affect the air to fuel mixture and cause low or high idling. 4. Clogged or faulty fuel injectors. Bad injectors disrupt flow of fuel to the engine and will cause rough idling or engine stalling. 5. PCV valve issues (stuck or defective already).
Click this
link from our CarParts online resource blog for more details of a rough idling of the engine.
I hope this helps!
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