scuba_doo

Hi There , I've a 2001my wrx and on hard acceleration @ 3000 to 4000rpm get what feels like a slight miss but if you accelerate quick but putting the gas on slower feels ok , power also feels down a bit.
Not had the car long and it's my first scooby .
Anybody had a similar thing ?
Been suggested that may be mass air flow or coil's .
Help!