ok i am new to the civic forum, so please be gentle. I have an 89 civic,1.5, auto with air. I couldnt find this specific problem. The idle is fine engine warm or cold, but as soon as i turn on the A/C the idle starts to rev up and down. Not crazy high or any thing, but enough to notice. And when I turn the a/c off, the idle returns to normal. No codes on the ecu, any thoughts. The Haynes dosent really have anything for this problem, so any help would be great.