Jeff; sounds like more of a coil breaking down issue . Have you checked your sparkplug colour . If your fuel filter was plugged same symtoms could appear also . A loose carburator flange nut or leaking fuel line allowing a overlean condition can also cause this condition check out the plug and other carb situations 1st otherwise I would lean towards the coil .

Weak spark makes a rich condition. A dark or wet plug . I would check for leaks if concerned about leanness.