Turn the 3mm adjusting screw for c/o with the idle valve disconnected.....do this disconnecting BEFORE you run the engine. You'll blow the controller if you connect/disconnect with ignition on.

With motor fully warmed...turn the c/o adjustment clockwise 1/8th of a turn and allow the motor to stabilize..... do this again until smoothest idle achieved.
Not sure on yours, but early cars had an air idle adjustment screw to the right of the thermostat housing...yellowish plastic nut headed screw with a screwdriver slot in it.....turn it clockwise to lower idle speed.


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