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This common with older furnaces with a heat activated blower switch.
As the switch ages it gets weaker..The burners come on, heat the furnace, switch senses heat and kicks on blower. Burner goes off...switch senses when it cools and then shuts off...BUT..in the case of an older switch it shuts off and then the warmth still in the furnace activates blower again until cool.
The only true fix is to replace the blower switch.