This still sounds like a faulty ground or miss aliened igniter. I have always had tube equipment as part of my setup. I have never had this problem. Please post the maker of your furnace, Model and Serial Numbers also Style number if available. Carrier & Bryant use style numbers, they are important. Email them if you like. I will call the manufacturer and find out how to repair and or lookup service bulletins if available. I will send you what ever I get but do not try to repair it yourself.
WARNING: Gas furnaces can be very dangerous and should only be repaired by a qualified tech. A furnace is NOT a do it yourself product.
WARNING: Gas furnaces can be very dangerous and should only be repaired by a qualified tech. A furnace is NOT a do it yourself product.