Hello, I have an older model furnace model Armstrong gas EG6G125DC20-2 forced air furnace. I notice the blower will run when the thermostat is turned to the desired heat, there is clicking on the unit as if the gas valve wants to open or it is calling for heat, but after a few try's the burners never lights. There is a pilot light off the thermocouple, but not a flame. Can anyone help me on this one. And the furnace continues through the cycle and the inducer fan blower continues to run and it will eventually shut off. Is this the gas valve? HELP!!