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I had the same exact problem and chased it for a month or so and it ended up being what everyone I talked to said it couldn't be. But soon as I replaced my valve cover to fix my pcv valve that was leaking and it some how caused the same issues. Once I fixed it and talked to a BMW tech at the dealership he confirmed that it would cause these issues. Hopefully this will help you. I started my car and put a lights flame up to the Pcv Barb and it sucked the flame in. Good luck I know this is a old Post but might help someone reading it oneday
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