Make sure it also isn't a plugged up catalytic converter. I had the same thing happen on a return trip after fishing up in Canada with an 88' Blazer. We could drive for a number of miles, and would gradually lose power. After pulling over and letting it cool off for awhile, we could get going again. Luckily a very nice woman pulled over while we were stopped and told us to drive it into their resort a few miles down the road. We had it towed into Thunder Bay the next day and had the catalytic converter replaced. Ran like a champ after that.
If you can run a code check on it, make sure you are not getting any for the exhaust system. There are a number of things that can cause the symptoms you are describing, but the exhaust system is one that can be overlooked sometimes. Whatever it is I hope it is a simple (and inexpensive) fix.
Good luck.
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