It did this before the new parts were installed? Have you measured the KV's of spark? Use a spark tester...one that adjusts open to 3/4 inch.
In the air, a coil can fire 3/4 easily. Just using a spark plug is no good. Also, the pick up coil or igniter can go bad. You can buy complete distributor with coil and igniter/module for reasonable price.
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