t-top99

iTrader: (1)

I recently just bought a 2000 Trans Am M6, it starts and idles fine and it drive fine up until about 2200 rpms through about 3000 rpms then runs fine. In this rpm range it noticibly loses power then when out of this range it pulls hard again. It has engine codes up for catalyst efficienty and O2 sensor voltages. The guy i bought it off of said he recently replace all the O2 sensors on the car. Does this cutting out sound like it could be from my cats needing replaced or am i off base thinking this? Mods are cat back, ls6 manifold, throttle body, larger maf, slp lid and and cai. thanks guys!