I have a Whirlpool gas range, model# SF362LXSY. Stove top lights, oven won't. Clicks like the igniter circuit is working though there is no visible spark or glow. If I take the plate out of the oven bottom and light the oven manually when the gas valve opens, it will continue to ignite on command as the temp drops for the duration of whatever we are baking. If I don't light it manually, it will not light at all. Seems odd, it won't light or ignite to hold temp unless I light it manually the first time. Any thoughts?