Hey guys I have a 1997 Mazda B2300, I'm having an issue were it has an intermittent stutter, this happens at different times, sometimes at idle other times it happens at different speeds and in different gears and sometimes it will go a day without happening. The only codes that are showing are P1443 and P0420. The truck does not have a converter in it so that explains the P0420. Any help would be highly appreciated.

Have you checked for water in the fuel? It may be picked up intermittently by the fuel pump pickup as you corner, brake, accelerate, and cause misfire and stutter.
Second choice would be to watch the plug wires at night with the engine running at idle. If you get a light show, you likely need new wires, but check the plugs also for larger than spec gaps.
Third would be to insure the EGR is not operating out of limit. It should not be used with the engine at idle. You can check that the valve operates, opening and closing, using vacuum on most, or a probe on the diaphragm to move the valve pintle.
tom