So I have a 08 mcs with 122k, Im getting a 2783, 277F and 28AA codes. In the past 12 months I've replaced the fuel filter, fuel injectors, HPFP, all the coil packs, spark plugs and have done a carbon blasting. Ive hit a wall with these codes and have no idea where to go next. Any helo would be greatly appreciated

 

My 28AA is caused by a faulty diverter valve. Specifically, an external BOV connected as a DV, but connected in the wrong places. I'd suggest replacing your DV with one of the aftermarket versions from one of our NAM vendors. Might even help with the misfire codes.

 

Wasn't thinking diverter valve, so I didn't mention I have a GFB DV+. Maybe the solenoid it self?