Irratic throttle issue persistent, then suddenly quit with full-up!
 

Okay, very strange! Could I have had bad gas that just affected the sensors when the tank got below 1/4?
Suddenly running very smooth immediately after filling up with fresh gas.... after a hair raising ride out of Eureka Springs. Going to ease it to Branson tonight and run to an import shop in Springfield Monday morning for a diagnostic check-up.
I'll update how it goes! Adventurous trip so far!