Sounds good. I would also check the throttle body to make sure it is clean. Sometimes, carbon built up there could hurt your idle. Intake system cleaner spray could do wonders.
Thanks for the quick response guys. I'll try changing the tune back to stock, if that doesn't fix it I'll look for a leak.
2014 Mustang V6 3.7L 6-spd manual, with MGW shifter, Airaid CAI, BBK shorty headers, Corsa Sport axle back, strut tower brace, JLT oil separator, GT500 differential cover, BG Synchro Shift II gear oil, Redline differential oil.