I have a Trane furnace. It was new in 1993 when I bought the house. I have had to replace the ignitor about 7 times already. The ignitor sometimes stays lit and sometimes works properly by turning off once gas is present. Again, it is an off and on situation. The identical furnace in the attic has no problems with the ignition system at all. Do you think the unit needs a new box where these connections are located. Please advise.