Gas dryer- heats one cycle

Before I run out to replace this 15[?]yr old Magic Chef, I thought I'd ask for a second opinion.
I took it apart yesterday because it wasn't heating. I checked the limit switch & thermostat & both had continuity. Put things back together & it seemed to work fine. I had a small load of clothes that dried.
So I put in a full load & went away. When that was still wet after a couple hours I went back to the drawing board.
With the dryer apart I fired it up this morning & watched the gas ignite fine, run for a couple minutes, then cycle off like it was supposed to. But when the dryer called for more heat I could hear the click and see the igniter light-- but there was no gas. It would try to light for 5-10 seconds, then shut off for a minute-- then try to light again.
I rechecked the thermostat & limit switch & they both still had continuity.
Then I noticed the igniter sensor that doesn't seem to be mentioned in the schematic. That tested open when tested with my ohm meter.
When cool, it tested closed & the dryer ran a single cycle again before shutting the gas off. [The igniter still lights & tries to light the gas.]
This is the part- http://www.repairclinic.com/0081.asp?RccPartIDH1312
I'm guessing that this $30 part might be the culprit, but it looks like it operates on light, not heat, so I'm hesitant to spend $30 for nothing. [My limit for this beast today is $100]
But then I checked the coils while cold & hot. When cold I got continuity between terminal 1 & both of the other terminals on the 3 terminal coil. The 2 terminal coil had continuity between the 2. http://www.repairclinic.com/0081.asp?RccPartID473
When hot, I only get continuity between terminals 1 & 3 on the 3 terminal coil. [and between the 2 terminals on the other] No continuity between terminals 1&2 on the 3 terminal coil.
It is a Magic Chef YG20FN1 .
My instincts say get the coils-- but I'd hate to get them. . . then the flame/igniter sensor. . . then a new dryer. [The gas valve alone, if that is the culprit, would send me off in search of a new dryer.] Does the above test sound like a faulty coil?
Thanks, Jim
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-snip-

Just as a follow up-- I saw the coils online for as little as $14, [I had seen them for $35] so I decided to go to my local store & try them.
They were $26 there- so in the interest of expediency & home peace I picked up a set.
So far so good. It ran through the initial cycle & fired up a second time, so I'm going to put it back together & load it with clothes.
Jim
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wrote:

Hi,
Good catch on the coil heating up and quiting!!
Least expensive place that I found on-line for the coil kit 12001349 we through A1Appliance.... http://store.yahoo.com/cgi-bin/clink?a-1appliance+tSwkBf+dryerparts.html I used there part# look up with the # posted above.
Glad to hear you got the dryer repaired :)
jeff. Appliance Repair Aid http://www.applianceaid.com /
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