Gas range Flame
 

Just today, the gas flame on all burners is yellow/orange. Anyone have any ideas why it is doing that. Never did that before.

Google is you friend, repair man is too.
The flames from a natural gas stove can tip you off to a possible hazard. If you see orange flames instead of blue flames, the burners may need cleaning or adjusting. The orange color alerts you to your gas stove's improper combustion, which may emit unsafe levels of carbon monoxide gas.

air/fuel mixture changed and not for the better. the flame should be blue