Throwing code P2098 .. can you guys help?

I had someone take my hi-flow cats off and I sold them to someone and I had that persons stock cats installed ...

Now I sold the magnaflows with the O2 sensors on them .. and the guy sent his stock ones back with his stock sensors ..

I also had my mechanic retune the car, remove the custom tune and bringing the car back to stock ..

I drove the car for like only the 5th time since mid Sept the other day and the thing isnt running/shifting right.

There is a massive shift hesitation between all gears, which maybe I'm not used to cuz the tune i had hide it ..

Anyway .. the engine light came on and the following code came up ..

P2098 .. Post Catalyist Fuel Time System Too Lean Bank 2

Can someone explain this .. I had him clear it, but it came back after a couple miles ...

 

btw .. the only things left on the car is my 2800 stall torque converter and my blue-top shift solenoids which I am going to have pulled out this week or next week.

the car still has the K&n CAI and the BT ported TB .. those I am going to leave on even after I sell it as I dont have the stock parts

 

does "rear" or "bank 2" tell me a side I should look or a specific sensor ..

also, should the flange for the stock cats mount flush to the manifold cuz mine have a small gap

 

oh and thanks Erik

 

thanks Adam, I will check it out!

 

hmm .. dont knwo what an antifouler is

 

thanks Steve .. I dont have antifoulers then .. never have either