My Kenmore gas oven wasn't lighting, so I replaced the ignitor with a new one. The ignitor now comes on, but I need to turn the oven knob off and on a couple of times to get it to start, and it doesn't ignite the gas. The gas valve opens, I can smell the gas, and the ignitor glows red, but no lighting takes place. Could the new ignitor be bad or do I have other problems? Thanks!