I sure could use some help. This GE dryer is intermittent in its heat cycle.The igniter lights the burner,but it only stays on for about 7 seconds,then cuts off.After about 20 seconds it trys again,but cuts off. Ive replaced the igniter,and coils on the gas valve. The thermostats test ok for continuity, as well as the flame detector. I thought problem was coils,but after replacing them, still same trouble. Any help would be appreciated