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Hi I'm Brian and I'm here to help!
It sounds like your inducer blower wheel is in process of self destructing. It's best to replace the inducer fan as an assembly (that's the way it's meant to be done). Click Here for a source for your inducer assembly for a very reasonable price. Click Here for a great You-Tube video of a technician doing the replacement. FYI, it's not a horrible idea to replace the inducer fan airflow proving switch at the same time while you have everything apart. If you're reasonably handy, this is a pretty simple repair.
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