2005 OBXT Stutter on Acceleration and P2096 Code

My car has been stuttering/surging on acceleration for a while now. It has a
check engine light and a P2096 code that tells me that the post catalytic O2
sensor says that it’s running too lean. Some of the things I’ve done to try to
fix it are:
- Cleaned the MAF sensor
- Replaced the fuel filter
- Replaced the upstream O2 sensor
- Replaced air filter

After I got the car back from the shop with a replaced O2 sensor the car was
running great but on more acceleration, I noticed the surging again and
when it persisted, the CEL came back on. The only modification is that I
removed the intake resonator but I sealed the hole and I’m pretty sure I had
this problem before I did this. I’ve heard that it could be a faulty TPS, but I’m
honestly out of ideas. Any help or advice would be greatly appreciated