Magic Chef LP range produces soot whenever oven is on.

The vent (shutter) allowing air to mix with the gas has shut. Access the burner with the oven off, of course, and look for the shutter (a sliding 'door'). It usually has one screw holding it n place and an elongated slot to permit adjustment. It may also turn. Since your burner is producing soot, you need to open the shutter more. Loosen the screw and slide the shutter open more. Turn the oven on and look for a nice blue flame, and one that doesn't run too far over the burner. Keeping in mind that everything there will be hot when the burner is on, and also for a long time after it is off, you can use a long-bladed screwdriver to push the shutter back and forth to get the flame you are looking for. If the screw is loose, a gentle tap will be enough. When you are see that optimum blue flame and you are satisfied, let the oven cool off for an hour or so, and final tighten the screw--making sure you haven't moved the shutter much when tightening. If this doesn't work you have a bigger problem and need to call a service person. Your local gas company sometimes will direct you to a person.

You can find the vent as the burner mets the orifice, this is part of the burner it's at the end of the burner , the invention of the stoves to burn gas, is that they have to have a vent, so everything that burns gas it has to have the vent for the mixture of gas and air. or you will have the soot,wich can not be burne inside.