Same issue for me too. Rough startup and car drops below 500 RPM feeling like it is going to stall. This is after I complained about long cranks and the dealership updated the software. I got a CEL while driving and the car stuttered really bad. When I got home, I hooked up my BT and there were misfire codes on 4 cylinders. Have a service appointment this week.
Cobb S2+ | AR DP | Helix FMIC | BMS DCI | Forge DV | ER UCP | KW V1 | BMW Performance Exhaust | P3 DBG |