I have replaced battery and cables. Alternator had a blown rectifier which was fixed. Replaced spark plug wires and those boots. Plugs were recently put in new. Car still won't run right. Kind of like not enough power at low end and under load(AC) runs real rough. Once you get moving into upper RPMs its ok. With AC off it seems to be better. Doesn't want to accelerate until upper RPMs. When in park and idling there is a slight miss at first when you rev it. When put it into gear it really starts acting up. There are no CEL codes. It's the V6 automatic. Been at this for two weeks and can't figure it out. Any help would be appreciated.