[James79]

It idles good just misses real bad at low speed but when you get up speed it don't do it I don't have no idea what it can be

 

[Fairmont79]

It idles good just misses real bad at low speed but when you get up speed it don't do it I don't have no idea what it can be

Welcome to the forum, much help is available here! As to your problem, I'd try a new spark plug as a place to start.