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Make sure the pressure regulator located on the gas line is functioning correctly. If there's any orange color in the flame it's possible the regulator is malfunctioning. Another reason may be the gas/air mixture ring may be clogged with spilled matter covering it which would restrict the air entering the burner .
If you are cooking with propane or natural gas, you may need a new regulator for your range, the black soot is most likely too much gas being used to make the flame. But, as for the soot on the bottom of your pans, try letting the pan soak in a mixture of baking soda and water, then attack it with a brillo pad. Hope this helps!
Wellif you uninstalled and reinstalled the same appliance it should work the same.. thats weird that it changed. however the black soot is usually from flames that are to high. you could try tightening down the orifice where the gas comes out.
The flame is 'yellow tipping'. This means there is incomplete combustion and will leave black soot on everything. Did you recently start using propane? If so the stove will need to be converted to propane use, or the incoming gas pressure is too high. You may need a gas professional to check the gas pressure.
Are you using natural gas or propane (LP)? It sounds like you may need to change the orifice size on the gas lines going to each burner. If you are using LP and have the orifice set for Natural gas, the flames will burn higher and hotter, causing heavy soot. Under each burner, there should be a small nut with a hole in the center at the end of the gas line. The hole for Natural gas has a slightly larger diameter than one for LP. Your stove should have come with extra orifices as part of a conversion kit. Could this be the case? There's also another orifice in the main gas regulator in the back of the stove. Have you checked to see if the orifice for the regulator is set correctly? Does the oven burn hotter than usual with heavy soot, too? If you could please answer these questions first, I can give you better advice. Let me know...