My first thought is check the connections (especially inside the coil-end of the coil wire). I've bought wires with really shoddy copper ends that are standard, instead of the special ceramic/spring connectors I needed. Cheap wires, but not the right wires.
Other ideas:
Maybe it's a defective coil or there is a problem with the wiring. The power connections to the coil can develop corrosion inside the crimps, and if you have the 25-amp fuse under the hood, that can go bad too.
How does it run with the old cap/rotor/wires and new coil?
Good Luck!
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