Well thanks for the input. I think I will at least do the tranny fluid, coolant, and get the brake fluid looked at. The truck has been out west all of it's life, so moisture in the brake fluid may not be an issue.
So last week I picked up very nice 2017 Yukon SLT with 22k miles on it. I swear the thing looks like it just rolled off the show room floor. Other than the occasional rough idle when it's warmed up, it works perfectly.
The idle has me a little concerned, but I am wondering if it just needs...
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