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I doubt its the pulleys themselves. And I wouldnt recommend aftermarkey "performance" pulleys either.
Change the belts like you know you have to, adjust the idle adjust screw and clean the iacv on the back of the intake mani. Those will make it so the idle doesnt drop lower than its supposed to. You should do that anyways.
As far as the sound...is it like a metallic squeal?
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