Jonas, Besides a vacuum leak. Could be a idle speed thermister/sensor in the internal water pipe. John Hervey www.specialtauto.com -----Original Message----- From: Jonas P [mailto:Delorean3543@xxxx] Sent: Tuesday, August 26, 2003 11:16 AM To: dmcnews@xxxxxxxxxxxxxxx Subject: [DML] idle problem This problem usually only happens on cold starts. After starting my 81 D the engine races up and down. At an idle in park it sounds like someone is pushing up and down on the gas peddel. When you put it in drive it still happens but not as bad. Sometimes I can rev the motor to around 4000 RPM's a few times and it quits. After the motor warms up a bit it stops. I know for sure I have a vacaum leak, John Harvey is putting together a silicone hose set to replace my old ones. Would a vacaum leak cause this type of problem? If not, Anyone know what would cause this? Thanks Jonas 3543 To address comments privately to the moderating team, please address: moderators@xxxx 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 Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/