2000 4.7 Blowing black smoke

Durango blowing black smoke out of the exhaust, replaced both o2 sensors no more than two months ago. I am getting the same codes off of the scanner. Neighbor thinks the Cat converter is clogged yet when I gun it exhaust does come out.
An exhaust shop said the converter should be okay, and it could be a fuel injector?? Which route should I take? Should I go after a converter or go with the fuel injector??

This no help. But I have the same exact thing going on. Im glad you posted this. Im anxious to find out what the problem might be.

Still haven't done anything.. Could the Throttle Posision Sensor have anything to do with this?? This will probably be my next move?? Any help or ideas appreciated!!:banghead:..

Cat Converter was clogged..:runaround::runaround: