I also had a P0171, P0174 codes. PID data showed LTFT and STFT at 25% indicating a lean condition. I too, found my PCV hose damaged. The picture shows the bottom side of the elbow with some cracking, thus allowing in unmetered air. My local dealers did not have the $30 hose (p/n 6767) in stock, so I stopped at my local NAPA store and purchased a $7.50 heater hose that had a 90 degree bend in it, then cut it down to the proper size. The NAPA hose that worked for me is p/n 7398. To help with the installation of the new hose, I found that removing the metal PCV tube (p/n 6K666) at the rear of the engine made it easier.
