my car makes a humming noise when i accelerate, what could that be???

2004 CADILLAC DEVILLE
150,000 MILES
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SWEETJAMESJONES
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when i stop it doesnt make any noise, but when i press the gas my car begins to humm
Mar 31, 2012 at 3:29 PM
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FIXITMR
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does it change in volume/pitch as you go faster? does it do it when you rev in neutral?
Mar 31, 2012 at 5:24 PM