Depending on how its cycling, it could be the flame sensor needs cleaning. As being discussed in another thread.
Basically as a safety feature, once the thermostat calls for heat, the furnace starts its heating cycle by adding gas to the burner with the igniter firing, if there's nothing wrong with gas delivery or the igniter you will see blue flames start to heat the exchanger, but immediately it will shut down, because the flame sensor isn't sensing flame. It things its just dumping a bunch of gas in the house.
If you google flame sensor cleaning its really easy to do. But as with anything natural gas related, be careful.
The cycle is usually pretty quick and you say it runs for a bit first, so I'm not sure. Maybe its intermittent.
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