I just got done reading a bunch of posts about idle problems people have after a header install and am going to apply some of it to the idle issues I have now (I just installed MAC's w/ catted Y). I have another problem though. I have a part throttle stumble right off idle and in OD when the converter locks at light throttle the car bucks a bit. Sometimes it's bad and other times it's tolerable. I think I understand what I have to do for the idle, but I need some help with the bucking. I tried to add some timing in the cells where it occurred, but to no avail. Any help would be appreciated. Thanks!