Just returned from a 12 day trip to Austin TX (from central FL). I fueled up about 30 miles outside of Austin on State Route 71. It was a older Shell station out in a rural area with no customers. Of course I got 93 octane.
Anyhow, the next morning the idle would surge to 1200 to 1800 and stay there. If I jacked the throttle I could get it to go back to a regular idle but within a few minutes it would do it again. After a couple of short trips I stopped in at Cowboy Harley (South Austin). They went through everything after getting me in right away. All was fine including everything to do with throttle body. No codes or history.
Finally the service manager decided to dump the tank and refuel with their fuel. It still was acting up on the test drive but he said to give it 40 or 50 miles and it should straighten out, which by the time I rode to Waco it was okay again.
He suspects that many vehicles owners are not using 93 octane because of the recent price increases, therefore some smaller stations may have that fuel sitting in their tanks for a couple months or longer. Not sure what fuel was bad that I pumped but I know the fresh fuel from their dealership did the trick.
The remainder of the trip I only fueled at busy stations and started putting a little additive in with each fill-up. I certainly hope this doesn't get to be an issue.