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Hi I'm Brian and I'm here to help!
It sounds like your fan & limit is doing its job! An 81 degree rise is high. You should check your air filter, your blower wheel and if you have an ac a-coil on your furnace, check that too, check that they are all three clean. With that high of a rise, it sounds like one or more are dirty! I wouldn't leave the limit jumped out, that can be dangerous!
Let me know if I can help further.