Only two burners lighting (right rear and left front). The left rear and right front do not spark. I thought maybe it was the spark module, but ruled it out by removing the burner head and just placing the burner cap closer to the electrode, doing this made the electrode spark. Could the burner cap be so worn out that over time the gap between it and the electrode is to big for the spark to jump? This stove has sealed burners. Any help is appreciated!!