Sounds like something is sticking or not working until a higher temp causes it to work. So, I would be suspect of any engine management sensor that is temperature activated and any related vacuum lines. Your case is interesting because many idle problems are after warm- up, not at a cold start. I would be careful to check that the air sensor plate is moving freely when cold. If the piston the sensor operates is sticking it will cause weird and sudden engine surges. Sometimes Marvel Mystery Oil in the fuel can help cure this. The idle motor may also be sticking, moving too slow or limited in range when cold. Check and clean all electrical connections too, especially the connections on the frequency valve and on the fuel pressure regulator. Harold McElraft - 3354 --- In dmcnews@xxxxxxxxxxxxxxx, Enid/Jeremiah <hispanicangeleyes@xxxx> wrote: > This is a unique problem. When I start my car now, the engine will run half lean and half rich. The driver's side (4,5,6) all run rich (spark plugs are charcoal colored), and the passenger side (1,2,3) are lean. The mixture screw has 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/