Need some help. Bought the kids a used 2012 Legacy Premium 2.5 with 130K on the odometer. It's been running great for the first 6k miles but just yesterday threw up a bunch of codes and will barely start and then quits promptly. Very low rpm when started. Sounds like it struggling for air, fuel, something. Any ideas on where to start to diagnose and repair? Need help quick. Wife and I do not want to start driving kids around again 