It sounds like putting a Weber on an auto might not be a good idea then. Especially when it's being used in a hot climate. I didn't give the idle rpm drop while in drive and stationary any thought and trying to ramp idle rpm would make for a terrible driving experience but I guess the factory carb would've been causing a similar problem anyway...

*I did a 4G52 w/T904 swap into a Colt wagon as my very first drivetrain swap. It boogied. But my state is renowned for it's summer temperatures and it would struggle with engine temps on the hottest days so I added a second washer bottle and ran the washer hose with an irrigation micro sprayer on it to aimed at the front of the radiator that was triggered by a momentary push button switch on the dashboard. When I saw the temps heading towards 75% of the gauge I'd give the switch a hit and temps would return to normal quickly. A sort-of ghetto fix that was neatly installed but was 100% effective in fighting off engine overheating. If I figured out how to get it triggered by a temperature sensor and had it run for only 1-2 seconds it could've run by itself if I ever forgot to keep an eye on the gauge.