Mark. What is your idle speed. I would bring it upto 950 as normal. Then see what it does. If it still hunts and the 02 sensor is good, then I would re adjust with the AC on. John Hervey www.specialtauto.com -----Original Message----- From: id [mailto:ionicdesign@xxxx] Sent: Thursday, August 14, 2003 3:46 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] Hunting with A/C on When the engine warms up to running temp the cold idle hunting is gone. I turn on the A/C with a warm engine and the idle hunts again. I turn off the A/C with a warm engine the hunting is gone. What is wrong? Mark 6683 To address comments privately to the moderating team, please address: moderators@xxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/