Its probably an intake manifold leak or a dry belt. check the dry belt by physically looking at the belt at look for cracks or and wobbling pulley. Try adding a lubricant to the belt to see if the noise goes away. If it does get the accessory belt or pully replaced. also check the leak by spraying brake cleaner (or another aerosol cleaner) around the manifold edge (where the intake manifold meets the block and where the gasket is) to see if the noise goes away. If it does then you need a new intake manifold gasket which should be taken to the shop to be replaced.
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