2008 Honda Civic vibrations?

All the sudden lately my Civic LX Manual started having a very noticeable vibration at idle once warmed up. I doubt it's the motor mount because I noticed the vibrations started as soon as the idling rpm drops a hair. It'll be fine when I stop then a moment later the idle drops a tad more and it starts vibrating. Not to mention my AC/Heater blower fan just went (what a coincidence) The vehicle also has 103k miles on it! So what would cause the drop in RPMs occurring with vibrations throughout the car?

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