Is there any way to test the COP coils? I had a severe misfire under load, and no CEL, no codes. I took the shotgun approach and replaced all of them (used the guy on Ebay - about $120 shipped to my door!!!). Truck runs excellent now. But, I have 8 coils in my garage, of which 7 are good. How can I find the bad one? Is there anyone that can test them?