As the engine has been idling high while warming up, I usually get it to slow down to normal idle speed by briefly striking the gas pedal, when I believe it is warm enough. Normal routine.

Something new however: Driving the car at normal operating temperature, the engine would idle at high speed – like at traffic lights, for instance – unless I repeat the procedure of briefly kicking the gas pedal like I normally do a few minutes after warming up. Every time, at every traffic light. Otherwise it would just idle at 1,500 rpm. Really annoying in the traffic.

Like if something was “sticking”. Any advice?  

|UPDATED|1/26/2019 6:45:55 PM (AZT)|/UPDATED|

Something in the choke pulloff mechanism is not working properly. Could be the choke stove. Everything should be free and slightly loose.

It's possible the throttle blade shaft is gummy, or the blades themselves. Might be time for a good cleaning on the carb, assuming there is no issues with the choke. I have seen many times the secondary throttle blades not returning to closed position due to stickiness. 

Sounds like it's time to take it back to the place that professionally rebuilt it and ask them what's wrong.

It's also possible the throttle blades might be hanging on the carb base plate gasket...seen that many times too, with kit gaskets.

OK. Apparently, that was nothing more than the cable sticking in its sleeve. I tried to inject WD40 in it, from the carb end, and it looks like it works now. Will see.

If the WD-40 doesn't work, try silicon the next time and it won't attract any type of dirt.

Good idea. Thanks!

I found that my problem with high idle speeds on my 71 Lt1 was sticking flyweights in the