Update: no issues since new throttle cable was installed until today. Feels like the butterfly is getting stuck because the pedal springs back but the feel of the pedal indicates there's no resistance from the throttle plate spring.

This time she spun to 6500 and knocked for a bit after it came back down. There is also an occasional miss at load that wasn't there before, but I think that may be related to dampness since there was a lot of heavy rain the last couple days.

I probably won't get to fixing anything for a while but will post back when and if I find anything.