When you replaced the coil pack, did you inspect the plug-in connector? Pull on the wires going to the coil pack. Sometimes those are damaged. Also check back about a foot or so and look in the harness for damaged wires. I'd also check anywhere in that wiring loom that is near something hot like the EGR feed tube. We've had a few SVT owners that found damaged coil wiring back about 2' from the coil, but most of the time the wires will simply pull out of the connector. If that's the case, then you need a new pigtail. Any Ford dealer can get you the part.
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Moderating everything now, let me know if I can help. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.