when turn on car it gets warm it sound like it sucking in air some guy told me its a idle air control problem thingy but im not sure and it rev the motor up and down up and down over..i wanna clean it and but i think its only temporary fix so i rather replace it..how much does it cost to replace...and how long can i run with replacing it ..and can anything else happens if i leave it with out replace thanks ....... please help