Got to thinking about the O2 sensor today and did a search on what contaminates them. The main thing that was mentioned on the bosch site is coolant and fouled plugs and that got me thinking that when the head corroded through there was coolant coming out the tail pipes and I know that cylinder # 4 wasn't firing because of the bad plug wire. Soooooo, My thoughts are leaning towards a bad lambda probe. I picked up a new one today and will pop it in tomorrow and see if that doesn't take care of things. Maybe the quest for a decent idle is reaching the end. Phil Priestley Vin 2105 IN FLUX http://alessandros120.com/ (503)370-9951 1(866)225-7985 [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx 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 Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/