My furnace goes off after about 2 or 3 minutes. The igniter lights the furnace. Just after the blower comes on the flames shuts off. I had the heating/ac people at my house a few weeks ago, they said I need an inducer motor because the fluctuation of the power within the inducer motor. Any suggestions. It's freezing! Ken

Usually vent motors either will work or not work, inless it is getting hot and shutting off. Sounds to me more of a limit problem. Does your unit have a control board with a fault code on it? Will the unit try to relight on its own or do you have to turn the power off to reset it?