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From the sound of things you are running VERY rich.. Most likely your EHA is acting up...Could be KE control, but unlikely. When was the O2 sensor changed last? Might be a faulty temp sensor, but I yet to see one cause a car to run that rich.
Black to white? Well, perhaps you started to burn off some of the moisture in the exhaust.
If you're not much for working on your car I suggest you take it to someone who is familiar w/ the car..You could start throwing parts at this problem very easily.
Jonathan
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