Hunting Idle Code59, (deadband or lag filter maybe)?

I have spent a LOT of time messing with the idle on my 2.3l quad 4 749 ecm code59!!! I usually get so frustrated i quit and go beat my head on the wall....seriously!! I have tried lowering afr with injctor constant, its at 12.8-13.5 with ipw as low as .59, no change, lowered and raised timing, no change, VE table no change, ISS no change so said f-it and left it..... I just happen to be searching on code59 forum looking for IBPW stuff to c if the low injector pulse is a problem and come across a thread a popular guy i see here a lot started about idle and another guy was talking about deadband and lag filter. I do not know what lag filter or deadband is so was wondering if anyone could enlighten me.....PLEASE :mad1: