You never replace anything, on a Wishing,Hoping,Pushing,Poking,diagnostic approach
You learn the vehicles Systems,Test,then Replace,if you have a failed component.
Work on the Misfire Issues.
Then you lean O2 Codes will go away.
Not a the plugs.
Think lean---Vacuum leaks,EGR Valve leak,EVAP System leaks,anything with a hose that lets air into the intake system.
Exhaust System leaks,near sensors
Can't find a vacuum leak.
Double checked every hose and vacuum connection.
Might need a smoke test?
A smoke test would probably be a huge help. these engines are notorious for leaks where the intake meets the heads due to warping (underbuilt plastic composite construction). dorman products sell an improved design that is reinforced. hope this helps
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