Re: Misfire and engine sign on
Warranty? Take it to stealer, they should be able to diagnose it no problem.
But it sounds like when it goes into closed loop and it doesn't see the o2 sensor its giving you that real lean mixture which is causing the misfire. Definitely the 02 sensors fault but since you said it was replaced, you need to see why they keep going dead.
Could be the wiring leading up to it, or may be touching on something and burning out prematurely.
Mods: A Bunch