Code interpretation please for 2000 windstar

so i posted a message last week about my 2000 Ford Windstar that the engine light came on. I took it to Autozone and he came back with the codes P0171 and P0174. What do these mean exactly and a cost for whatever needs to be fixed would be so much appreciated. (remember you're speaking to someone who knows diddley squat about cars =)
thanks
melinda

so i posted a message last week about my 2000 Ford Windstar that the engine light came on. I took it to Autozone and he came back with the codes P0171 and P0174. What do these mean exactly and a cost for whatever needs to be fixed would be so much appreciated. (remember you're speaking to someone who knows diddley squat about cars =)
thanks
melinda

Melinda

Here is a link of someone else having the same problem: http://www.automotiveforums.com/vbulletin/showthread.php?t=518396

Regards

Dan

You'll want to spend some time with this excellent discussion:

http://leckemby.net/windstar/windstar01.html

I did the suggested fixes on my 2000 Windstar; it runs great now.

Here is the site for the trouble codes:http://www.2carpros.com/kpages/diagnostic_trouble_codes.htm It says "too lean". If you go to Advance Auto they will give you a piece of paper with the codes and what they mean.
http://www.2carpros.com/kpages/diagnostic_trouble_codes.htm";
I had oil in my intake for those codes to come up on my 2000 Windstar.