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For intermittent sparking, intermittent ignition, one or two burners will not light problems. Make sure the igniter electrodes ceramic body is not cracked, make sure the finish is not flaking off from the inside of the burner ( remove the burner and shake it to see if any flakes fall out ). If all is ok, try Maytag's newest spark module kit, part# 12001596.
The spark module is often under the cook top at the back on older slide in ranges and down beside the drawer behind the drawer rail near the back on standard ranges. For built in counter cook tops the spark module is under the cook top panel.
Flat oven igniter kit
Maytag style spark module