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the first test shows that you had way too much fuel [no brainer] and this was keeping the nox down.you don't show o2 readings and these could be helpful.the things that you did to the engine after the first test leaned it down considerably[and i''ll bet increased the available o2 in the exhaust] and so lots of nox.your co needs to come up to about .05-.07 and that should keep the nox under control if the cat is working ok.
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