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Before shotgunning any more parts get this thing attached to a tech II.

Verify that the coolant sensor readings are being reported.
If the sensor sends disrupted info, for example, low coolant temperature, the air fuel mix will be disrupted rich.
This will set pre cat o2 codes.......but it is the o2 trying to tell you something is amiss upstream.

BTW.....my response IS based on your being certain the cooling system is full......RIGHT?

Rob
 
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