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Q: Noises on 2002 Pontiac Bonneville

When i accelerate there is a hissing noise you can call it coming from the engine or dash board. someone said it was almost like air coming from the window but i know its not cause i have had my window down and can still here it. I am just wondering what it could be.
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Exhaust leak or exhaust restriction. Does the car have good power?. If not maybe the converter, they sometimes will cause a hissing noise when there stopped up. Air intake resticted or not assembled correctly? Just guesing from your description.
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