We live in a mobile home with a Miller furnace fueled by kerosene, we just had it serviced but now after the cycle runs for heat after just approx 1 minute it starts again but only runs for maybe a minute then shuts off again. What is causing this?

Dirty air filter?

There is a control called a fan and limit or in your case a fan control. If the control goes out of adjustment it will cause this. On your style unit I do not believe the control is adjustable but you will need to check it out before replacing.