flatblack86GT

I have an 86 mustang gt that was swapped to a 91 computer mass air, or it was from california, i am not sure, but it does have a 91 computer,
anyway, when im giving it gas it stutters and bucks at 1500 rpms to 2200 rpms, after that it drives normal. i replaced mass air, map sensor, computer, throttle possition sensor, airfilter, fuel pump, fuel filter, still have the same problem. im getting obd 1 codes 95 ,22 ,66, please help, its getting to the point where im either going to sell it or switch to carb if i cant get to the bottom of this . wolfgreyred@yahoo.com