Like the title states, been getting an intermittent miss that has been getting worse at idle, either in or out of gear. I changed the plugs and wires, different times, after the wires were changed, it ran good for a few days then fell into the miss again.

I just changed the fuel filter and found the voltage drop between the battery - bolt and the engine block was 1/4-1/2 volt DC and the cable was loose, tightened it up and it has run pretty good for now. Will post back if it acts up and what I find... Hope someone can make use of the steps so far.

Still missing, changed ICM, still missing after that.

Alittle more detail, the miss starts as soon as you start the van, it will do it hot or cold, almost dies sometimes at a stoplight. I also had a coil pack that when I changed the wires the tower post was rusted I replaced that as well.

Now have new plugs, wires, ICM, fuel filter... Any ideas? BTW IGN advance is -20 to -40 for some reason, the HIGHEST I have ever seen by blipping the throttle is -5 (never been positive.)