[Erodinator]

here is my story:
my car had a loud noise one day while driving and it shut off, it was hard to start back up. Once it did that loud whistling sound was there, kind of like a pulley gone bad. It turns out it was the oil seperator valve (I know there is another name for it too), it's a common problem with E90 and possibly even other BMWs. Once they replaced that, the car was still having codes and was hard to start. Once started it shakes and feels like misfires, the mechanic took it to the dealer and they told him that it's the crankshaft position sensor. I'm getting it replaced in a couple days, I will update to let you all know if that fixes my problem.

Crankshaft Position Sensor problem

Crankshaft Position Sensor was replaced, no more problems.