Code misfire cylinder 3 (1 Viewer)

[sonny]

I have check engine light with loss of power and rough engine. Check engine light with code misfire on cylinder 3. This only happens when driving on interstate 65-70 mph. The truck will recover and run normal below 60 mph. I plan to replace plug and wire. Any other suggestions? Thanks

 

[tmxmotorsports]

Check the injector plug could be loose or broken.