Arthur,
I have just checked the throttle setting with the cardboard test and can confirm that the idle speed dropped. I deduced that the throttle flap was not completely closed. Indeed, the flap was slightly set open and I adjusted the set screw to ensure the flap was completely shut. I opened to idle screw and the idle was still high. I then turned the mixture screw two more clicks CCW and adjusted the idle speed to approx 800 rpm. I could not get much more speed than this. The throttle linkage balls needed minor adjustment after this work was performed.
I put the car into gear and it stalled. I am now in the process of adjusting the constant speed solenoid setting to allow for approx. 700 rpm when in gear.
Regards,
Tassie Tiger