Car running rich - smells of fuel while idelling. Any ideas?

[Fluellen]

Yes, looks like neither of the O2s is working. Even at idle your scan tool should report switching voltage; e.g. the O2 voltage should sweep between approx. 0.2V and 0.8V. O2 sensor output is not a percentage, it's a voltage between 0 and 1V.

So yes, something didn't go right when the O2s were changed...