suburban oven won't heat up

Hi. Just got back from a 4 day stay here in lower Michigan and tried using the oven on our 2004 3023. The 3 top burners light up great. The pilot light also lights up fine. The problem lies in turning the oven temp knob up to any temp. The pilot light only gets bigger , the oven won't light. I waited 1 1/2 minutes with the pilot light flame high but still nothing as far as igniting the oven. Any clues as to what's wrong and is it difficult to take the oven out if I have to fix the trouble? Thanks, Jeff