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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.
The car no longer surges uncontrolable at idle. Now I have a new problem, or maybe the same one, but it was just hiding under a faulty IAC. Whenever an electrical load (A/C compressor, second cooling fan, even headlights) is applied at idle the RPM drop from 800 to 500.