I'm retired, and trying to figure this out. Erratic idle any time. Start up, while driving, stopped at red light. Sometimes normal, more often than not up, and down. No vacumn leak, good comp, no loss of power, gas mileage(20mpg). Changed all sensors, no diff. Changed IAC. New from ford. Diff. Unplug iac and engine behaves normal. Upon startup, I just keep idle up till warm and its idles fine. I've also changed the brain. Along with the pcv valve, and rubber grommet on the valve cover. WHAT'S MY PROBLEM?
Wednesday, June 25th, 2014 AT 4:18 PM