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Vacuum leak or intake seal issues post MAF(or MAP?)? Youre N55 so you should have a HPFP sensor and low pressure sensor so you should be able to rule that out(or in) if its fuel related. You can get a cheap WIFI/Bluetooth dongle and a free app to connect to your car and view it live to confirm fuel theory.
I ran an BMS intake for awhile and it cuz'd weird idle issues as well. I'm just trying to make a first post so I can send a PM, hopefully its helpful but probably not. good luck
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