I changed my front o2 and it didn't do a thing. Idle is still bad. Other threads on here lead to the Idle Air Control Valve on the throttle body. I've subscribed to several of them, but no one has posted updates if they worked or not.

 

Im in the same boat i think its your tb shaft seals..but could also be the Fic injectors come to think of it ever since i put in those injectors im having the same issues as you.

 

The tuner said he dont like my injectors and he doesnt wanna tune another car with them..

 

My front 02 sensor is throwing a code too.

 

Get a new tuner. FIC injectors are some of the best injectors for EVOs.

If your having issues since you installed the injectors, its because they are not setup correctly.

Also, fix any codes you have before you get tuned.

BTW, did you know this thread was from '09

 

The 02 check light went away by itself..pretty sure it'll be back..Yea I saw the 09 thread..Was waiting for someone to chime in..