Welcome to the wonderful world of vacuum leaks. Because fuel/air mixture is set while your engine is idling in the driveway (maximum vacuum), leaks can lead to a false setting -- appears OK only because of unmetered air. In fact it's too rich, which will show up at throttle as manifold vacuum drops. That's why vacuum leaks are MPG killers. But I don't think this is Phil's problem. I'm leaning towards either SEVERAL non-firing cylinders (I recently lost just one to a dead plug wire, and performance was only minimally affected), or overall retarded ignition due to either an improperly indexed timing scale or failed advance inside the distributor. Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, doctorDHD@xxxx wrote: > > Does this statement make any sense? > > I can lean the mixture out to the point that the engine > starts to die and it's still running rich. > > Something is wrong with your rich / lean assessment. > > Can you explain what you mean? > > > D² & 6530 > 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/