Hi all I am finally going to have the mechanic set my c0 next week .. its the same one who did my ac and such.. I do have a question though... as the car is set right now.. the idle flucuates when the engine is hot.. it will not hold steady unless I adjust the c0 screw really rich so the frequency valve cuts off.. or very lean.. the car will still start and run well cept for a few seconds during warm up if i have it set to the lean postion..but in this postion the exhaust burns my eyes cause i guess the computer is making the car really rich to make up for it?? the car accelerates and runs great in either position.. but any where in the middle and the idle fluctuates.. now it doesnt do it alot mind u.. just goes up and down between 1000 and 500 rpms.. thats it.. u can hear the motor doing it too.. any suggestions before i take it to the mechanic?? Also I have another question.. my idles drops really fast when u let off the gas..and the idle will go to almost zero before it catches.. I can fix that by adjusting the bottom screw on the arm that trips the micro switch .. that makes the throttle plates not close all the way though which isnt right... any suggestions on this also??? Also would my 02 sensor being bad make it fluctate?? If i unplug it the system defaults to rich and runs like a champ.. its only when the frequency valve cycles the idle fluctates.. Any help would be great before I take it in.. Ps.. i replaced the 02 sensor last year when i did the new exhaust.. but it might be messed up from running too lean for a year.. thanks..Dave..vin.. 15275 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/