Have you checked the dist. cap and rotor, plugs and coil - at high rpm they have to perform flawlessly. Check for a crack inside your dist. cap - stranger things have happened on new product. Have you metered your spark plug wires - they should read- I believe - 700-1200 ohms. They should all be about the same in resistance. Like I said - could be a bad new wire - just cause they are new - doesn't mean cannot be bad. - Is you idle nice and smooth?