my 06 mustang gt has a ton of upgrades all professionally installed. but lately the car has been doing this things where at around 10lbs of boost it starts choking like its not getting enough air or fuel. i have taken it in and diagnosed and they couldnt find the problem. they say the tuning is perfect but the car is running a lil lean but not bad..doesnt make sense in my eyes either but what are some things i should be looking for?