I have an old GE XL44 gas range and one day the left burners wouldn't ignite.I figured the ignitor went on that side.I was tearing it apart to see where to disconnect the ignitor's wire and I had already taken the two screws that hold the ignitor down and I noticed there was rust around the screw holes.I wondered if maybe the trouble was a ground problem , so I got some steel wool and cleaned that area.I sprayed some anti corrosion spray on it and put the ignitor back on.I plugged the range back in and the ignitor was sparking away when I turned each burner's knob.Those little ignitors are not cheap and finding the cause saved me a few bucks.Rule is from now on to try the simplist cure first.