[ActionMaxon]

Most of the reference specs that I have access to involve the use of an oscilloscope. If you have one, I can get you some useful info. Otherwise, you'll have to search out info.

I also looked up the P0171 for a 2013, and it indicated that a thorough inspection of your intake plumbing is warranted. Wherever the intake tubing has those bendy bits you'll want to look to make sure there are no breaks. If the intake tubing is cracking, you could get intermittent unmetered air going into your engine. (Like in the case of on/off throttle where the engine is torqueing/moving slightly) If this is happening, you may get those erratic fuel trim readings, as well as a lean code.

Go over those hoses really well with a bright flashlight looking for cracks/tears wherever it flexes.