The ignition module should provide a spark at all the surface burners at once, until one or more of them lights off, then stop sparking at all the burners, once it senses a flame. The symptom you're describing is usually caused by grease or food deposits on one or more of the ignitors. Check to make sure they are all clean, before attempting to replace any parts. It's a good idea to burnish them with fine sandpaper.
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