You mentioned old and thermocouple, so does that mean you have a standing pilot?
If so, then the theromostat only sends 24 vac to the gas valve. Measure the voltage to the gas valve. By turning the thermostat on and off many times, its a good guess you have an issue with the thermostat, thermostat wires, or a sticky gas valve. Measure voltage at valve and tell us more about furnace.
If you have a high efficency gas furnace, then you may have many issues. Need more info.
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Today's Featured Article - Fire in the Field A hay fire is no laughing matter-well, maybe one was! And a good life-lesson, too. Following World War II many farm boys returned home both older and wiser. One such man was my employer the summer I was sixteen. He was a farmer by birth and a farmer by choice, and like many returning soldiers, he was our silent hero: without medals or decorations, but with a certain ability to survive. It was on his farm that I learned to use the combination hand clutch and brake on a John D
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