My check engine light came on yesterday and I went to Auto Zone to pull the code. Well, the codes he they pulled were P0170 and P0171. He said it could be the intakeor the exhaust, but didn't sound to sure of himself. So, now I'm here hoping you guys could help me out.

 

http://autorepair.about.com/od/obdco.../OBD-test2.htm

what kind of car do you have, yr. make and model
and mods you have done to it?

 

Check for vacuum leaks, find someone with a real scanner (not the autozone scanner) to check your O2 sensor voltage, and also check fuel pressure.