run-away throttle was partly tune related, maybe totally tune related.
tune fix was de-sensitize upper end of throttle sensitivity table and raising the "wot enrichment" throttle volt trigger and wot mode throttle volt trigger. setting these too low can cause throttle blade to pop open when you don't want it to.
the "wot enrichment" throttle volt trigger does need to be lowered vs stock though, for proper part throttle boost fuel enrichment. can be a bit of a balancing act to set this in a sweet spot.
changing decel fuel shutoff trigger may have helped too
Keith tinkering with blow-off valve may have helped also