I have a gas dryer that runs but does not heat. The igniter glows for a few seconds but the gas valve never opens (guess)...I have already changed the solenoids twice but it did not help....The gas is line connected and the supply valve is open....It actually had a few little spurts of flame come out ot the the valve going into the igniter but only for a split second, then nothing....just the igniter glowing, then shutting down for a minute or 2, then glowing again....
Any help is greatly appreciated...

I had this a one time, igniter glowes, flame flickeres, then shutdown, would cycle through and try to restart. Not knowing what else to try I noticed that the igniter was dusty and saw there might be a small "window" pointing to where the flame should be. After cleaning the dust off with a soft ratail brush then wiping with a windexed dampened paper towel, got lucky and it worked. Could have also been a loose wire in the circut don't know.