Ahh, grasshoppah, the problem with your insolent range runs deeper than merely a bad igniter. What's happening is the gas valve is not snapping shut the way it's supposed to and it's letting gas leak at the end of the cycle when it should be shut off. This rogue gas hits the igniter, which is still hot but cooling off, and flashes, creating the mini-boom that you report.
I have a kenmore stove. Inconsistantly after the stove is turned on after several minutes I heard a boom from the stove. The kitchen smells like gas, but the stove is on. I would assume from your trouble shooting guide that the ignitor was the case. Do you have any insights/surgestions....Master
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Solution: replace the gas valve; three mugs on the SUDs-o-meter.