Originally Posted by
steveo
you have to experiment with idle timing and idle speed. try to get high vacuum without any 'roughness'. too little timing is rough, and so is too much.
your cam is very small, i would expect no more than 20 degrees timing would be required for a smooth idle. 30 degrees is for a big cam. imo, of course.
have you forced open loop to see if the blm trims are why it's rough? is it rough while warming up? if it's rough before it even hits closed loop, it's probably not an AFR problem. it's timing or something else.
your trims will be screwy if your timing is out to lunch, or if there's some other problem...
are you sure it's running evenly on all cylinders? perhaps there's some other reason it's idling rough?