Thank you very much Karma.
I just watched the cycles with the front panel off. The igniter glows every time the burner cycle starts and the gas comes on and ignites for three or four cyles. From that point on, the igniter comes on but the gas doesn't and then the igniter just goes out, of course. Would bad coils work that way - in other words, work for the first three or four cyles every time I turn the dryer on when the dryer has cooled down for a while and then not stop working after from that point on? ALso, if I turn off by opening the door, then quickly turn it back on, the gas won't come on even for the first cycles. For some reason, the dryer has to sit for a while and then when it is turned on, the burner will light for three or four cycles.
Also, would bad coils prevent the timer from advancing? Does the burner have to cycle on and off correctly for the timer to advance?