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Does anyone why does bryant plus 90 furnace run properly for 7 minutes, then shut off for 22?? Then it will run for another 7, and shut off for another 22. Does this all day long, so it takes...

I have a Bryant Plus 90, model 398AAW036080. Year on rating plate is 1982, but I know it was installed a few years after that since I've only lived here since 1984. I had to have the gas valve...