Q: Engine wanting to shut off at complete stops or slowing down lower than 15mph

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okay well i have recently replace all my spark plugs and one coil. My car is still wanting to shut of and stop signs or a light. When i restart the car it struggles to keep on, but once i get above 15 mph its fine? what am i dealing with??? plus my check engine light come on and off like a ghost. i have replace my battery, mass flow senor, turbo case, crack shaft sensor as well all in the past month

My car has 17000 miles.
My car has an automatic transmission.

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