Mark,

The igniter is the most likely cause. you can verify it two ways.

1. the voltage is typically 120 in a gas stove for this circuit. Using
a voltmeter measure the voltage where the igniter connects while the
oven turned on to operation.

2. Remove the igniter and test it with an ohm meter. It should measure
between 50 - 600 ohms. If your meter reads an open it is faulty.

If you do not have a meter, remove the igniter and do a physical
inspection, you should see a spot on it (sometimes white, sometimes
black) where it burnt "open"

The cost is about right having replaced mine only about 3 months ago
and now the igniter in my gas dryer died as well.

Joe