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have you changed your plugs recently? if you did, did you notice any particular looking a lot different than the others?
theres a few things that could cause a rich condition like that, barring that the pcm is not toast or aftermarket...
injector could be stuck open
fuel pressure reg could be shot
fuel pump could be on the fritz, unlikely but possible
some other sensor is malfunctioning causing the pcm to think something is going on when its not.
its a good possibility your new o2 sensor is bad. not sure what brand you got, but i would only use a/c delco brand o2 sensors.
make sure not to touch the tip of the o2 sensor.
other sensors to look at is that AIT, TPS, MAF, MAP, and even a bad ECT could cause you to run rich/lean
you will probably want to get your hands on a multi meter and test things out.
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