car is a lancer itlog EL model.

Here's the thing i noticed with the ride. Bagong tune-up lang yung ride including carb cleaning, new plugs and oil.

When the air-con is off and is not engaged yet, mataas ang idle speed nya though i dont have a tach, dinig mo mataas talaga. But when the aircon is on and engages, tama na ang idling speed nya. again, based lang sa nadidinig ko. Pero madali naman ma discern yung mataas sa mababang idling.

what seems to be the problem here?