I doubt it will be your o2 sensors (these cars probably don't even have o2 sensors they have laf sensors) they don't typically age like classic o2 sensors. If I'm wrong and it does use classic o2 sensors then it's even less likely as o2 sensors usually fail being stuck at a low voltage which tells the ECM the system is lean (when it truly isn't) and ends up adding fuel so it's actually running richer.
I would be curious as to have clean the backs of your valves are. Or what you knock sensor data is. Sounds like the system is bumping the timing really far.
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