Q: Why a vibration is felt when the AC is on during stops on street lights?

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When the AC is on and I make a stop on a street light, I feel a vibration that seems to come from the engine. The vibration in that situation is not steady. It comes like the waves in the ocean. it can stop for a little while and do it again. When I driving the car I don't feel the vibration. I appreciate your help.

My car has 25000 miles.
My car has an automatic transmission.

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