Same problem on mine. i had a tune up done to the engine and they pinched the PVC hose from the air cleaner to the intake manifold. It was taken off and pinched backwards. Check the PVC valve and hose to make sure there are no restrictions
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Without hearing it, it is hard to tell. But, I would first be looking at the idler pulley bearing, they have been known to fail; and make noise. Remove the idler pulley, and spin it manually. If it feels rough, and makes any noise, it is bad.