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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.
I revved the car to 4000 and allowed the car to go back to idle. As the rpm drops to idle speed, the car stalls. As I attempt to restart the car, I had to crank it a few times. I don't think air pockets in the cooling system will cause all of this.