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You may have loose hub bearings. My wife hit a curb and jerked the alingment out. This went unoticed for awhile then the hum got real bad. Take it to a tire shop and have them check for loose wheels. If the bearings go out the car will go one way and the tire will go another. NOT GOOD!!

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Q: Why would a car make a humming noise during acceleration and deceleration?
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