NEED HELP with my Turbo 2 rx7!!

[TougeGTR-33]

Hi guys im new here! I just got an rx7 turbo 2. I am a nissan enthusiast and im pretty mechanically inclined, So I bought a turbo 2 today and I am having problems and im not sure where to start with this rotary.

The problems. Its a stock motor with a street port (said the owner) Its breaking up sooooo bad it. Smells like fuel and just bearly putting you foot on it it sputters and such. I can drive the car but only If I find a sweet spot with the accelerator, even then it sputter alittle.

the owner said it has 550 cc primary injectors and 880cc seondary or vise versa. cant remember. Car has a s5 turbo. and I have a narrowband on the car, it just says RIIIIIIIICH lol. Is my car just super rich, or could it be something else?? i have a safc 2 on the car but ive never messed with the settings and not too familiar with it but im sure ill figure out how to change stuff. Maybe the coils? spark plugs?? Let me know what you think!!

Thanks guys!!