[WillyG22]

Hi friends, I have a 2011 BMW 550i N63, it started to give me problems with the System Too Rich (Bank 1 & 2), and misfire in cylinders 1 and 5, I replaced spark plugs and coils and the misfire codes disappeared and I was left only with the system too rich, I started by replacing the low pressure pump, the 2 HPFP, until I finished replacing the 8 injectors and that solved all my problems, I drove the car and it felt great, I had no pending or permanent codes and today I went to put gas at the station where I always fill up my cars, I put in 91 which is “the best” that is sold here in California and the moment I started the car it started to shake and shake a lot and 5 seconds later the Drive Train Malfunction meter appeared and the Check Engine came on, I saved and put the Scanner and again they were codes P0301 and P0305, I went home luckily I had some spark plugs to spare and I changed the spark plugs and switched the coils from 1 to 2 and from 5 to 6, I started the car again and it continued with the same shaking and eventually the check engine light came on and misfire in cylinders 1 and 5, as additional information, I feel the car's idle when I put it in Drive or Reverse it is very low, it is around 500 and 550 RPM, in Park and Neutral it is between 650 and 700 RPM, I don't know if it will help but it seems strange to me, if anyone has been through the same thing or has a possible solution to this please help, I think this is going to drive me crazy.