me a headache. First is the car a basic twin turbo ? Any change/ modifications in injectors etc. You have a new harness so the problem if it persists must be in the computer. You already wrote you changed your CTS with a new Nissan OEM one ? 1. Ohm out your injectors to see if they are all good. 2. Change your computer with another good one. Make sure your grounds are secure and not having a wire pinched.3. You already ruled out boost / vacuum leaks. 4. Also the rich condition could be to having the wrong injectors or wrong programming for the injectors, and like some one wrote maybe pinched o rings if you did any injector exchange. We don't know that either. If the car was consistently running and having the rich or lean condition , your O2 sensors can be the culprit. I lean towards your ECU though. Good luck .
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