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Hissing sound when accelerating

Hi, new to the group, have a 2004 Jetta TDI, and lately have been hearing a hissing sound when accelerating! Saw the check engine light on, and went to Autozone, code was P0299. Now the light is gone, and the hissing sound still exists. I suspect that there is an air leak somewhere, so I raised the car and looked underneath, Is there anybody who has had this situation? Shri
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