I have not any noise during idling, just the rev had fluctuation look like is the a/c comperssor start or stop. And feeling like somone push my car lightly. My car's engine is 2700cc petrol.
Has anyone noticed that when the car is stop at traffic light (engine idel), the car's revs become unstable, suddenly rising as if someone were pushing the car. I suspect it is related to turning off/on the A/C compressor.