97 gsx 7 bolt

car boggs down under boost.
i usually hit 15 psi and eventualy does the t-25 thing and starts to fall off. but now as soon as i go into boost it feels like it is boggin down. my plugs were fouled so i got new ones ran great for a minute then boom , its doing it again. now i cant even get 5 psi before it bogs down. plugs are fouled again , sorta.

the only mods i have is a full 3 inch exhaust. i do have a slight exhaust leak at the down pipe ( dwn pipe meets 02 housing.) but this has been for a month now with no effect.
the rear o2 sensor has just got changed. the cel light is on but for p1105-fpsolinoid-which only comes into play during cold starts.

i have pulled the stock uic pipe off and felt inside for oil. there is none and all of the pipes are snugg. didnt feel like any hoes or rips. i felt the car up a week prior so i dont believe that its gas either. the car does seem to smell like its rich but that could be from the exhaust leak

please dont tell me to take it to the brothers or jerry just yet. i live an hour and a half away. i would like to try yalls ideals first.nothing personal.




could it be the fuel pressure regulator or a seized injector ?
please help me ?!?!?!?!?