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actually it could harm the transmission. The transmission needs constant fluid to maintain temperature and lubrication. If the engine is not spinning the torque converter and then the pump, there is no fresh fluid being pumped through the tranny. Over time, this could result in the tranny being overtemped in certain areas, reducing the life of clutch packs and other parts.
It is advisable to either coast in nuetral or coast in gear. Do not shut the engine off while coasting in an automatic transmission car.
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