Code P0171, vacuum diagram needed?

So, what happens with these engines is the EVAP tube has O rings that go bad and allow a leak. This problem can also be caused by a MAF sensor that is off a little which leans the engine out. Here are three guides that can help us fix the problem. Make sure you check the engine when it is cold.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Here is the location of the MAF sensor so you can check it out. Make sure the air tube is secure with no leaks. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.