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Sounds like a high temperature limit switch is opening and closing.
Does furnace have a control board in blower compartment?
Can you give me the complete model number on the furnace?
The number on outside of furnace is just a series.
Actual model will be on a label on inside furnace panel just above burners.Remove panel to burner compartment and look inside. The model number will help me give accurate assistance for your specific unit.
Below is a link to a generic video showing where to find label with model number:
1. How long do burners stay on before shutting down?
2.Does blower keep running entire time?
When furnace burners are off and should be on check all limits to see if one is open
Burners should stay on continuously until thermostat is satisfied