Hi I have a Mercury Cougar V6 and recently the check engine light went on and idle was going high when i press the gas pedal. The rpms go up and down and then come to normal every time i press the gas pedal. I got the car scan and it said the idle air control valve was malfuctioning so i switch it for a bran new one and i still have the same problem but when i disconnect the valve from the cable its connected to the car runs great the rpms stay normal but the check engine light its still on what can i do should i leave the cable plug in or unplug it?
May 26, 2010 at 9:21 PM