I have a York Diamond 80 furnace. The first two burners light up but the others won't. After about 4-5 seconds the burners turn off but the fan is till running and blowing out cool air.. What do I need to do other than calling someone.. Please help.. Thanks

Sounds like the flame jumpers/burners are dirty not allowing the flames to jump down the line. It might be best for you to have a professional make a on site visit to check out exactly why this is happening since it is not normal operation.