Q: when in park or stopped at a red light my car seems like its about to shut off

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when i'm in park or stopped at a red light my car all of a sudden drops RPMs to about 500 about to shut off and then goes back to 1000-1500 RPM.it also starts to shake but then when i start to drive it seems to be fine

My car has 101000 miles.
My car has an automatic transmission.

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