[Sledge]

Gents: after a closer look, the butterflies were not hanging up in the base plate. After ensuring the fast idle screw was off the fast idle cam, the throttle would come right back to idle. I'm not sure what else I did that might have affected the return to idle issue but it is acting normally now.

As for the crap California gas, I've built a short hood hold-open rod to allow the heat to escape, and have wrapped the fuel lines at and near the carburetor with heat shielding. Not pretty but appears to be effective. Yes a pain in the neck but better than dealing with the fuel vapor. I also obtained two small battery powered fans that I can aim at the carb and fuel lines on hotter days to help move the hot air out.

Not ideal but it works. The only investment was in the fans. The other stuff was in my pile of accumulated but unused or repurposed cobra stuff.