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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.
A bad hose in any part of the engine is easy to fix. Sometimes, vacuum lines cause a rough idle due to a vacuum leak, and these lines are also simple to replace. A common cause of an engine running rough is faulty ignition timing. Once the timing is adjusted, the car should run smoothly. The idle speed may also be set too low.