No when he said replace the wires, you have oil in the plug wells, which is caused by seals under the valve cover that prevent oil from getting into the plug wells going bad. They get old over time and then oil will leak into the wells, and it gets worse over time. This oil also destroys plug wires very quickly, and its possible yours are already going bad due to the oil. So you need to change the plug well seals, and the valve cover gaskets, and then probably replace your wires as they've probably gone bad from the oil, then the misfire will most likely go away, unless of course the dis module is bad, but, I wouldn't jump to that conclusion just yet.