My R56 threw a CEL P0014 and P0012 and would bog down when I try to accelerate. The car actually runs fine when I first start up but then a couple of miles in I feel a little jolt and it accelerates poorly, especially between 2-3000 RPM. I have pulled and cleaned the VANOS solenoid, I have replaced the fuel filter (when it was bogging down prior to throwing a CEL). Oil level is good, oil filter is changed. Using 93 gas.

 

What about your spark plugs and connectors?