Going to look at a Tahoe. High miles-should I worry

[Slow Build]

Long overdue update:

When I last post I had said I would be changing the engine when I had the money together to do so. Well, that wasn't happening back then. I ended up using Head Gasket in a Bottle, a $60 miracle cure. I knew it was a temp fix but it held for a little over a year before letting go. I finally ended up with a junkyard engine with 101,000 miles on it with a 6 month warranty for $1800 including installation. So I have been able to keep it on the road but still haven't fixed the AC or the fuel gauge issue. I was never able to get anything out of the dealership except a threat of a lawsuit if I didn't stop my CL ads.