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A gas furnace will have a pressure switch with a vacuum line looking hose between it and the fan housing. It's pretty common to have the outlet of this hose at the fan housing get clogged with lint or the sorts. So take the vacuum line off of the nipple at the fan housing and using a small stiff piece of wire/toothpick/pipe cleaner/small allen wrench poke it in the nipple a few times then hook the vacuum line back up and see if she works.
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