1996 Dodge Truck 1996 Dodge Driveability Issues

Engine Mechanical problem
1996 Dodge Truck Four Wheel Drive Manual 189900 miles

Hi, I am having some issues with my truck. I have a 1996 Dodge 2500 4x4 - V10 5speed. When I first start the truck it idles fine, but cannot drive it until it reaches operating temp. It sputters, jerks, and is definately running rich. Which by the way is the code that keeps popping up. I have tested the fuel pressure and it is good. Replaced O2 sensors and Air Charge Sensor. All other sensors seem to be fine. I thought maybe a clogged Cat, but it seems before I purchased the truck 3 1/2 yrs ago, someone else had an issue with them and the are gutted. Sorry for such a long post, but this has been driving me nuts the past few weeks. So any and all help would be appreciated. Thanks in advance.