2002 4runner stutters after O2 replacement

I had one question about my 2002 Toyota 4runner. My engine light vsc trac vsc off were on, I got the engine code and it was Bank 1 Sensor 1 O2 Sensor. I ordered and installed a "Denso" replacement, the lights went off but now I get a stutter from the car. It feels like a loss of power and a hesitation. Would I need to look into the Mass Air Flow Sensor? or tune up post O2 sensor install.

"Back Story----->" Lights were on for about a month, Replaced gas cap first then found out it was the sensor. I didn't have money so I couldn't replace it at the time. Car was a daily 20min round trip driver that ran solid before and during the lights being on. Any help would be appreciated, thanks in Advance

 

I changed the same sensor on my 02 and had the same issue,getting ready to do a complete tune up on it to see if that will help,just hope its not the sensor.ordered all my tune up parts on line oem Toyota parts,sensor was the same one you installed

 

Mine was the factory sensor on the car, I swapped it with a Denso 234-9002 & New metal Gasket. I tried again tonight to verify all was good and disconnect the ground for 10mins to reset the system. I took it out for a 18mile loop and it didnt seem as bad but at lower speeds 15-25 it felt a little stuttery..... Some were saying the Mass Air Flow Sensor and the Throttle Position Sensor...... Not sure on these, I may just take it to Toyota and see what's up.

 

So I didnt have the money until two weeks later, I just took it easy and around the 35mile mark it started to go away. Currently I'm at the 65mile mark and I alsmost dont feel it at all anymore..... maybe the CPU just needed to adjust to the new O2 sensor/.

 

did the tune up cleaned the mass air flow and the throttle body tried a different throttle body from the same year and it seemed worse than mine so I changed it back.Tried everything I could find on you tube but at this point still doing the same thing any one ever had this problem Not doing any codes so not see what the issue is feom as far as codes