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Does anyone know what could be causing this noise when i start car it will start on and off for a few minutes after i drive it awhile it seems to quite down. sometimes it will sound when driving. also when i turn off car it will sound like air pressure was released. the noise seems to be coming from the center top of car around manifold. I dont think its pulleys or pump bearing in the front. any ideas would be appreciated.
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no power steering is full. sound seems to come around the manifold area. car runs ok just that noise its annoying still trying to figure out were its coming from ghead
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its annoying still trying to figure out were its coming from 
ghead 
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