burner and orfice are clear. How do you test the board?

HI Robert
I have had the pressure checked by gas company they said the pressure was really good right where it should be.They seem to be puzzled why it is doing it. They mention maybe the circut board but they said they have never seen one do this in the newer furnaces

I have a coleman furnace model#DGAT056BDD Serial #970346567 We just replaced roof jack and gas valve because the repair man said it was needed after changing the valve our blower will come on and go back off again about 6-10 times befor it will stay on and run through the cycle just fine. this was n...