Kenmore Oven Not Igniting

I have a Kemore Oven that is not igniting. The gas burners are doing fine but the ignitor is not glowing at all yet it appears to be in good shape (not broken). When I turn the oven knob I can hear a click but nothing happens. I did replace the ignitor last year as I had the same problem but then the ignitor only glowed slightly and once replaced all was good. This time nothing is happening. Should I still replace the ignitor and/or the thermostat and/or the oven control knob?
Any info would be greatly appreciated!