My furnace runs for about three cycles then the little fan just runs and won't relight until I shut off fan switch.then it will run for three more cycles. If I turn on my propane cook stove the furnace will keep cycling and will keep heating.

if i turn on my propane cook stove the furnace will keep cycling and will keep heating.

Are you saying that the propane cook stove is controlling the operation of the furnace? Explain?

What is the Exact model number for the furnace?

Is this in a mobile home?