Originally Posted by 2008crna
Check your tune. If you use a CAI without tune it will cause a higher air mixture to fuel ratio (hence the term running "lean"). I suggest returning your car to stock with your tuner and then reflashing to the tune you want. This makes sure you start from a clean flash instead of reflashing a bad tune. You must do this soon. Running lean is bad for your engine.
And if you have the option, send in any data logs to whoever does your tune and have them update it. This is popular with the 2011+ guys that have Bama tunes