I have read up on this site that an improper installon on a CAI that it can casue your truck to run lean. What is this?

I am getting a K&N CAI Fri. and was getting a little worried. CAn I get some advice and help from my fellow F150 friends.

 

Lean would be too much air and not enough fuel based on the size of the CAI. You should be ok with the K&N setup.