I can turn off power and turn on but when the burners come on they stay on for about 4 seconds and some time the one burner at the thermocoupler will not fire right away . Even when it does fire it won't cycle but 3 times but the blower never comes on . Where should I start to look ?

I had a similar problem last year where the burners would lite for a few seconds then shut off and the problem was the sensor.

are you talking about the flame sensor by chance? Is it something I should replace or you think it can just be cleaned and it will be OK ? What did it take to get yours working again ?
thanks for your help it is greatly apreciated 150 % =)

The repairman replaced the sensor and so far it is running good.