I know this issue has been beaten to death, but MAF cleaner costs less than $10 and it should be the first thing to try. It worked for me. I bought a new one for backup $190, but haven't used it yet. Try cleaning the MAF first. It's 2 screws and anyone can do it. That is all, carry on~

 

Yeah that work big time on my Audi, it made a noticeable difference after cleaning.