Ty guys, I think that's a good place to start with cleaning the maf. I don't think it's an exhaust leak but very possible. I really appreciate the advice on what it could be. The vehicle did come with a mac CAI with the K&N and I cleaned the filter either really early this year or last year.
The only thing that was getting me though was it only did it in 5th gear and no other gears... so that's why I asked. I'll let ya know if I do have anymore problems in the future to see what is going on.