Have you checked the function of the control pressure regulator? The only part of the fuel system that adjusts mixture as a function of temperature. It's perfectly feasible, given it's an electro-mechanical device, that it doesn't behave as it should on cool down, leaving the mixture appropriate to a hot engine when the engine is just warm. You need to get a fuel pressure gauge on your car to actually observe the primary and control pressures in order to understand what's going on. Who knows, maybe it's an ignition problem (eg the connectors on the ballast resistors and coil - that's another favourite for this sort of problem). Martin 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/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> 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/