2008 f150 5.4l runs smooth at speed sometimes st idle it runs rough. When I rev the engine the rough idling goes away for awhile
I am guessing you need a tuneup or that a coil is going bad. Is the CEL on?
Looking for a Used F-150 in your area?
CarGurus has 10,095 nationwide F-150 listings starting at $1,800.
Search Ford F-150 Questions
Ford F-150 Experts
Related Models For Sale