Product review (5 stars): This fixed my problem! Genuine OEM part..
This Whirlpool part is the same part used in my Maytag Atlantis dryer.  My symptoms were that the igniter would glow, the gas would switch on and the burner would light, but would only stay lit for about 15 seconds before it would turn off.  After about 30 seconds, the process would repeat. Clothes would take forever to dry and the timer/cycle knob would never advance.  I first replaced the solenoid coils and high limit thermostat, but symptoms only changed a little.  The igniter would glow brighter, there was definitely a much louder click when the solenoids energized, and the timer/cycle knob would advance, but the same repeating on/off burner cycle of 15/30.  I ordered/replaced the radiant flame sensor, and Viola! The burner would run in roughly 1min on, 1 min off cycles (give or take).  This was a lower probability part/fix for the symptoms, but I'm leaning toward the fact that I had at least two marginally defective parts. Parts replaced were the coil set, high limit thermostat, and the flame sensor.  Amazon prime price for the parts, including next day shipping, $36.18.  If you have similar symptoms, I'd just go for all three parts from the get go. Super easy repair, took all of about 30 minutes and saved at least $200 on a repair bill. Good Luck! S.