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Hoping AndrewCologne pops up for this discussion.
Based on your symptoms, it seems like AFR reading may be too high as it doesn’t correlate with the CO measures. CO measure also sound like they’re set too high with oxygen sensor unplugged (range you mentioned sounds right). Have you tried the method of keeping O2 sensor in and testing duty cycle at warm idle? Should be around 50 for Lambda.
This is purely theoretical for me as am about to go through this. I’d look at AndrewColognes posts or check out his long post in his signature.
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