furnace burner goes off then on

I don't know about your furnace in particular, but generally if the heat exchanger gets to hot, the gas will shut off until the heat exchanger cools down some. The heat exchanger could be getting to hot because the air blowing over it is to warm to begin with, because the fan isn't blowing enough air over it, or the air is restricted in some way.
It's more common for the fan to run intermittently when the return air is to cold such as in cold weather and just starting the furnace in a really cold house. In this case the heat exchanger is getting to cold to fast.