First timer

[rockola1971]

For the one who asked to see more pics of the plug. I got you

That plug didnt break apart from debris smacking it. That plug's electrode melted off. Have a look at the end where it looks laser cut, almost a perfect EDM cut. That cylinder was running way too lean. PCM program or injector related assuming you have no ignition problem.

 

[Tonyrodz]

That plig didnt break apart from debris smacking it. That plug's electrode melted off. Have a look at the end where it looks laser cut, almost a perfect EDM cut. That cylinder was running way too lean. PCM program or injector related assuming you have no ignition problem.

Hopefully those plugs were genuine parts and not a knockoff.

 

[Mudsport96]

That plig didnt break apart from debris smacking it. That plug's electrode melted off. Have a look at the end where it looks laser cut, almost a perfect EDM cut. That cylinder was running way too lean. PCM program or injector related assuming you have no ignition problem.

Excessive heat killed the electrode and the porcelain was made brittle by heat and probably shattered from detonation.
Both over time, if not too terrible, will wipe out a piston. If it is bad enough it will be fast though.
OP, While it is a good idea to continue following the codes, you also should look into a borescope and check the cylinders. It is possible part of the power issue is declining physical health of the engine. (Not necessarily, but a possibility) if it wasn't tuned right.