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Similar thing was happening to me, but it was the coil pack.
If you changed out your coil pack and plugs, then I would look at the direct injector seals next. That could cause hesitation. Which cylinder are you misfiring in? Get a compression test. There are also special cases when the direct injector gets too hot, they can malfunction.
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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 |