[Shogun]

When was the last time you checked your plugs? I hope you don't use platinum plugs, which in my humble opinion, retain way to much heat by having two or more grounding tips on them in addtion to prolonged ceramic electrodes, also generally being catagorized to high in the standard plug heat ranges. They were designed for highway use and extra long life. Not suitable conditions for most modified Mustangs. Autolite 3924 is all you need for plugs. unless you have a power adder of some sort, then you might want to step down to a colder plug. Also, are you sure your timing is set to 10? I am by no means trying to insult your intellect, but I have had a few people with the same problem only to find out that they indeed checked the timimg, however forgot to pull out or replace the "SPOUT" connector by accident. Just an idea. I hope it helps.