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Thump when sitting still

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I drive a 2011 328i... Over the past couple of weeks, I have started to feel a hard "thump" when the car is sitting still. Wondering if this could be the AC clutch, tranny, or something else. Car currently has 93k miles.
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Not really hearing a sound, but the thump feels like the car is about to stall. AC seems to be working fine, gears are not slipping when in motion, not sure where to start.
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