Originally Posted by Baratacus
the cable goes to your throttle plate inside the carburetor and the acceleration booster, choke, and idle control are linked to it with a series of arms and levers. It sounds like your high idle control is sticking. It's controled by a heat sensative plunger on the back of the carb, and a vacuum actuated plunger on the side of the carb. If the plunger is down on the vacuum actuated high idle control, then it's not getting vacuum to release the high idle plunger. Check and make sure the vacuum line is connected and that it's not cracked or loose.
Bartacus would his carb have a heat sensitive plunger and a manual choke?
And to clarify for myself, is the vacuum plunger you refer to the one that is controlled by the headlights/heater being turned on?
So Samrod1 if the engine is idling normally and the choke is off, you rev it and the idle is now high, does the choke knob on the dash come on?