I could be very wrong too. Looking up the answers in the archives and on vendors sites I found these: http://www.specialtauto.com/delorean-parts/images/idleadj.jpg John says to tighten down all 3 screws. And as Bruce Benson said in 1996 on the DML: "Be sure the three adjustment screws in the throttle valve ass'y are closed as they aren't used in the DeLorean." Full page is here: http://www.dmcnews.com/backissues/jan96files/ dml060.html And the shop manual says: "The throttle body on the PRV V-6 engine contains an air adjusting screw and two air balancing screws. These adjustment screws are not used on the De Lorean since an electronic idle speed control system is used. The air adjusting screw should be fully seated to eliminate any air bypass at the throttle plates." My guess would be to tighten them all down. I'm sure someone who is more experienced in the field can elaborate on why. In any case, tightening them down had no effect or change on my car. -Patrick C. 1880 On Feb 12, 2006, at 3:08 PM, Alistair McCann wrote: > I was under the impression that the last screw is the idle speed > setting screw and that you can screw the engine up if you fiddle with > i 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/