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If you are having problems with the bake feature not lighting or taking longer than usual to ignite, you may have an oven igniter going bad. The following link explains:
http://www.fixya.com/support/r401858-replacing_oven_igniter_gas_rangeIf your broil feature still works, you probably don't have a gas problem. The gas for both oven manifolds is fed through the same source. Barring a problem with the oven control board, you more than likely have an ignitor on the bake manifold failing or has become weak. The bake feature tends to fail more often due to the frequency of use.
Read through the link provided and let me know if you have any questions. I hope this helps you.