What should I do if my Kenmore 790 oven is producing poor baking results?

Poor baking results may be caused by improper rack positioning, inadequate air circulation, or overcrowding the oven. Make sure to allow 5.1 cm to 10.2 cm (2" to 4") of air space on all sides of the pan, use a medium-weight aluminum baking sheet for cakes and cookies, and ensure proper preheating before placing food in the oven. You can also try adjusting your recipe's temperature or baking time and consult the 'Adjusting Oven Temperature' guidelines. (Page 2)