Ed, Be sure when your adjusting the fuel mixture screw that a little bit goes a long way. What I do is insert the 3mm long handle wrench into the hole with the handle pointing at the 12Oclock position then make the small adjustments left for lean or clock to enrich, just do it in 1/8" steps. The frequency valve should buzz all the time. What it's doing is allowing fuel to return to the tank as told by the Lambda system. John Hervey www.specialtauto.com -----Original Message----- From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of Ed Kane Sent: Friday, July 14, 2006 10:17 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] exhaust and idle Hello, I have just installed a dynomax muffler on my car. Now my car hesitates or sputters a little when i first give it gas. Not very much, but it didn't do this before. I think 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/