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If your o2 sensors are not functioning correctly, the car can most definitely run rich. I would definitely check those out. Sucks that they are somewhat pricey to replace depending on how many there are.
If there was a vacuum leak or post-maf intake leak, the car would run lean, so its probably not that, and I'm not sure about the EGR.
Maybe pick up a Haynes manual at advance and see if there are any "things to check" listed with the codes you pulled.
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