Check Engine Light

So for the last few days my01 Yota with the 3.4 been running really rough when I tromp on the gas so last night I bought a new fuel filter and its still running wierd then toady i notice the check engine light flicker on and off and now it fully on my yota is at 143,xxx mile and it has the stock o2 sensor is this my problem more then likely. And how do I know for sure????

 

Hi there buddy go to the parts store and have them pull the code they can tell you what it most likely will be sounds like the o2 sensor to me hope you get it figured out let us know good luck

 

Yea thats what i been figuring wich aint to bad but still kinda of a bummer since i thought i had the problem fix but it w.e Thanks Though

 

No problem with the o2 sensor out it will run like poo and shit gas milage get it fixed asap as your air to fuel ration will be off and I have seen bad stuff from not fixing it like cats getting burnt up, washed cyhlinders cus to much gas all kinds of bad stuff

 

Thank and Yea I know my gas mileage is shit right know