Welcome danite to irv2.
Your furnace may need some cleaning.
The flame sensor that is over the burner tube may have a carbon build up that has to be cleaned off. The burner chimney may have rust falling down on burner tube slots that has to be cleaned out with vacuum after gently tapping side of chimney so rust falls down. Place a paper towel over burner tube slots so rust does not fall in slots then vacuum out of burner area.
There is a screw to remove burner base shield to gain access.
Check the stickies above for more info.
Surburan Furnace