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Update:
Changing the spark plugs alleviated some of the issue. The plug gap was worn out. It would hesitate at anything above 50% throttle. Now I'm having the issue at the higher RPM range, always at 6.5k rpm, the car hesitates and wont go. I've cleaned the MAF sensor which I haven't cleaned ever (lol) and got the same results. I have a vid below.
[ame="https://www.youtube.com/watch?v=482kHy7oUJo"]Boost issue 1 - YouTube[/ame]
[ame="https://www.youtube.com/watch?v=sQJkR8Cv5T0"]Boost issue 2 - YouTube[/ame]
The 2nd vid hesitates at 6k which it doesn't do often. My tuner said it wasn't the MAP sensor. I haven't swapped to test as yet though.
So the list of possible issues:
MAP sensor
O2 Sensor
Vac Leak?
Coil Packs?
What other possibility?
Other note is my engine has 150k miles on it. The issue did start until 145k miles.
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Vortech SC on 9psi Pulley, Invidia Catless Front Pipe, Invidia N1 Catback Exhaust 
242whp/197ft-lb on Mustang Dyno (91 octane water)
284whp/223ft-lb on Mustang Dyno (E85)
Delicious Tuning |