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The A/C idle compensator solenoid is not functioning. This should be located next to the carb.
When you turn the ac on it engages the ac clutch which is turned by a fan belt which is turn by the engine. you are making the engine work harder. The idle speed might be set to low or it,s time for a tune up.
The idle is set too low or there is an electrical problem
AC idle compensator. Many vehicles have a sensor that increases idle speed when you turn on & add more load. Sounds like your idle not being adjusted. Have your mech check it.
Give the engine some extra fuel and see what happens when you turn on the AC. If there is still a problem then the compressor or AC clutch could be bad. If its ok then the fast idle needs to be looked at to find out why the car does not idle up when the AC is on.
An idle motor controls the idle-like when U turn on the AC,It will raise the RPM's so the engine doesn't stall. Idle motors are used on computer cars & instead of a screw adjustment.
Most likely cause is an inoperative condensor fan.
The idle speed control solenoid controls the idle of the engine when the air conditioning is engaged. Since the ac pump draws down the engine idle the solenoid increase the idle when the ac is on.
It's expecting the AC compressor to kick on to help the drying process. If you don't have AC, then I'm puzzled too..
When the ac is running the idle should be raised to compensate for the extra load. If the idle isn't rising then the car will cut off.
There is usually a solenoid that boosts the idle when A/C is turned on. If the car stalls when solenoid disengaged; the curb idle adjustment is off. Find the screw and give it a half-turn CW. Or, sometimes the end of the solenoid is the curb-idle adjustment . Put a wrench on it and try giving It a half-turn clock wise.
Was there any recent work done to the car? When did the idle problem start? Does the idle get worst when you turn on the AC? Answer these questions and then I may help.