When an idle speed that rises and falls occurs, first check whether the car remains safe to control. If the engine stalls in traffic or the throttle sticks, stop driving and arrange inspection. If the symptom is mild and no critical warning appears, note the conditions and arrange a timely inspection.
The owner’s manual gives the vehicle-specific response for warning lights. Check for intake leaks, a sticky throttle path, and recent work around the air duct. Do not continue a test drive when the car’s behavior becomes unsafe.
Quick educational note
For information, not a diagnosis or repair instruction. Vehicle-specific checks are still required. Consult the manufacturer's guidance and a qualified technician.
How to use this information
This article explains general principles and does not establish what is wrong with your vehicle. Read the content limitations.