92 Z28 305 49k miles at

Started throwing trouble code showing rich running and op temp was higher - evap canister was full of fuel so replaced + purge valve, ox sensor bad so replaced - now uns fine until ox sensor kciks in the runs rough and rich, not throwing trouble codes though - any suggestions? Injectors seem to be ok.

 

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all stock 92Z28 convert 305 at a/c CA emissions 49k original miles

recent new distributor, plugs, wires