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The vacuum solenoid may be for the Idle up actuator which is the solenoid and vacuum item attached to the carburetor.
The electrical part is to set the idle, when you shut the car off it retracts, closes the throttle completely and prevents it from dieseling.
The vacuum part kicks in through the vacuum solenoid and idles it up whenever the compressor kicks in, ideally it's adjusted so the idle speed stays the same with the a/c on.
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