does the top lift up on this ? Its really difficult to diagnose something without a model number unfortunately. sometimes the model # XXXXX XXXXX the top on gas units if you do not have sealed burners and the top lifts up. does yours ?
when this is preheating and baking do you see the element get red hot ?
OH okay thats better . the element is a lot less than the thermostat thats for sure. your element should look like this . does it ?