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try adjusting the idle-up actuato...this device raises the idling rpm whenever the a/c is on to compensate for the load of the a/c compressor.

its located at the driver side of the engine on beneath the throtle control arm on top of the injector pump it your pregio is diesel'll see somthing like a vertical disk with a rod comming out of the side.and a vacuum hose and screw on the other side.with the engine and a/c running adjust the screw clockwise to reduce engine speed and counterclockwise to increase engine speed depending on how you like it.then tighten the lock nut afterwards so the screw won't turn as the engine vibrates.
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