i have a 1995 Subaru Impreza wrx v2 gc8 the car starts really nice but when I give it hard throttle it gives a clean pull on the first and after it hesitated and on idle u can hear a slight miss fire what can this be?

i have done the following:
Checked maf
New fuel pump & filter
New plugs correct ones
New oil
Checked all vacum pipes
Checked all boost pipes
Change idle control valve
Changed throttle body
Checked coil packs for any cracks

hi yes it has a 2bolt coil pack that came on the car