What are these engine codes?

I finally got my check engine light codes read by autozone. I have two codes. They are code 171 and code 174. Do any of you know what is causing these 2 codes, and what I need to fix, so the stupid light will stop coming on?

You can do a search on this forum for p0171 and p0174. Basically, these codes indicate a lean condition, probably due to a vacuum leak. Most of us are finding that this requires the "isolator bolt fix".

Isolator bolt fix is for 1999 and newer windstars.
You will find great information at this link....
http://leckemby.net/windstar/windstar01.html

For 1998 and older, it is still almost always caused by a vaccum leak.
These engines use a different upper intake manifold, and does not have the issues with the isolator bolts and coming apart.
Look for a loose or damaged vaccum line.

Thank you for the info.