Recently, my Caliber has developed an issue where it will occasionally have a rapidly fluctuating idle. As of yesterday, I'm getting an intermittent lightning bolt warning light. It's giving me no codes however. Click image for larger version. 

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Reading the other forum, it sounds like the throttle body is dying (I haven't posted anything on there yet because Mouser seems to have something against me). Does this sound like an accurate diagnosis, or is there something else I should look for before I drop the money on a new one?