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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.
My 2005 GM Envoy has a rough idle when in drive care not moving. when placed in park, neutral or reverse, no vibration. Vibration is also worse when AC is turned on. Check engine light is NOT on. Need help. Thank you.