Bmw N52 engine rough idle. Non return valves cleaned!!!

Update on the video! after a few days the rough idle was back and I've found out that my CCV valve is broken!
See that video here: https://youtu.be/w0sGD_DH7Cc
Installing a stage 3 intake here: https://www.youtube.com/watch?v=SalVsl88k6E&t=152s
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Видео Bmw N52 engine rough idle. Non return valves cleaned!!! канала Warp Drive M