Classic PIP failure which means you should replace the coil too. PIPs eat coils as they are on the way out. I replaced 3 coils in my Cobra thinking I was just getting **** coils before I said "**** it" and replaced the dizzy. Fine after that.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.