I've noticed on my GT that it seems to idle a bit rough and I'm wondering if it's because of the K&N without a tune? I have cleaned the MAF sensor before and it didn't seem to help either. Anyone else have this issue before you got a tune?

I have a K&N Aircharger CAI. I did not have a tune when I installed it, I noticed no idle issues before or after the tune. I have a Brenspeed tuner (SCT 2) with 87, 89 & 93 octane tunes). Make sure you don't have any air leaks, especially downstream of the MAF. Do you have any DTC's?

Nope no DTC's, maybe I just need to run some injector cleaner through it then. I'll scan the car to see if something's up as well. Thanks for your reply!

Try Chevron Techron, the large bottle for 20 gal.