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Letting your car idle isn't actively bad for the drive train, but it certainly does put strain on the engine, additionally engaging the AC will put the engine under load, and work the engine harder even though you're not driving anywhere.
Itâs likely youâve experienced a rough idling vehicle â which just means the car feels rough and bouncy when the engine is running. There are several reasons why this happens â some major and some minor. A common cause â and also an easy one to fix â is a loose or broken vacuum hose.