I have a pulse furnace, or at least I think it is pulse because it has no pilot light, the fan will kick on and the you can hear the gas start to blow and then stop because it does not ignite, it tries a few times and then shuts down. The furnace worked fine and then it all of the sudden started this. Is there an easy fix I can try before I have to spend a lot of money on a repairman?

If your furnace is a Lennox pulse then you better call a repair person who has the knowledge to work on them.