1997 Ram 4X4 5.2

I replaced the plugs, wires, distr. cap, roter button. truck ran fine before the replacements. I have routed the wires as reccommended in
TSB 18-48-98. My ram runs fine for several miles, it then gets rough when a light throttle is applied. if you apply more throttle the engine smooths out. If you shut down the engine and crank it back up it runs fine for several miles then gets rough again. Any suggestions or help will be greatly apprieciated.

 

Any check engine light? Did you accidentally pull a vacuum hose loose or knab a sensor plug?