To all who responded - thank you very much. I did find a vaccuum leak upon closer inspection - the hose that connects the idle speed tube to the idle speed motor was very loose (as was the idle speed motor in its clamp). Now I don't have any acceleration loss/hesitation that I can discern, but I still get a funny idle after the car is warm (between 600rpm and 900rpm). So maybe I still have another leak. I'll go over it again, looking for vaccuum leaks as well as testing the lambda system, plug cables, etc). Thanks again for all of the helpful input. Bill 6976 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/