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Thermostat flame sensor. Do you see a little rod next to the pilot? That is what tells the main gas valve that the pilot is lit and it is safe to give gas. Easy swap, and you can usually just pick up a generic one.
I would venture to say that it is the thermocouple not picking up signal to keep the gas valve open. You can try cleaning the bulb end with steel wool and positioning it in the flame remember the hottest part of the flame is out on the end.
OK, the burners will need to have flame on the entire surface or it will trigger a sensor and shut-off. Get a brush and maybe even one of thoes can of air and blow off the burner. Stay away from the glow ignitor because that is very delicate. Once you get flame on all surface of the burners, the unit should stay lit.
the most common problem is the flame sensor located just behind the fire chamber, about two inches long in a round rubber boot with two wires. you can get one from mr. heater for about 3 bucks. the wires are a different color but all you have to do is splice them to your old wires. it doesn't matter how you connect them.