The burners all work, when we can get the oven to heat up we've usually had a burner running at the same time. Last time it was working we moved the thermometer around and got a 20 degree difference on the sides and played with how high the burner needs to be while it's baking. The burner needs to be on while it bakes. We've talked to Whirlpool, tried recalibrating, and now it doesn't want that. No warranty because we got it at used.
Our landlord is cool with us taking the repair bill off the rent and we'll have a qualified repair person take a look at it soon. In my spare time I was looking up what the usual culprits for inconsistent heating were as some times it works and some times it doesn't. Sometimes we hear a click before it works and some times it doesn't. So if it isn't somewhere in the heating elements then it might be haunted.