More Maytag Neptune MDG5500AWW dryer stopped drying. My son figured out that the igniter was not glowing. After replacing the igniter, the dryer functioned properly with the gas igniting and fan blowing. After we vacuumed and re-positioned the dryer, it stopped working again. Now the new igniter comes on, but no gas. My first thought is Valve Coils, however I'm not sure how to test. Do I need to use a meter on the coils?