Is your lambda system working? The fluctuating at idle when cold should be a rythmical up/down over about 3 seconds which suddenly stops. Otherwise I'd say it's the warm-up reg - even if it's new, put a pressure gauge on it and see what it's doing because what you describe is typical of when it fails. Martin stainless_dreams wrote: >I have been trying to hunt down my problem for weeks now with no luck. >Heres the deal: When I start the car cold, the Idle speed fluctuates >and begins to seek. 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/