Code PO171?

Hello, there is most likely a vacuum leak somewhere, if it gets better after it warms up, it might be the Intake manifold gasket, when things warm up and expand some leaks can be less at that point.

Here is a guide on lean exhaust issues:

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