The air conditioner idle control is part of the carburetor control system which
you already have. Perhaps the red wire from the control box to the idle boost
solenoid valve on the engine side of the firewall has been disconnected. Check
for voltage at connector B10 of the control box or at the solenoid itself.
Is your PGM-CARB warning light on?
If you apply positive battery voltage to the solenoid, does it operate?
Maybe the solenoid is just not holding the vacuum.
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