idles rough hesitates jerks around 60 km an hr untill u bring up rpms

2008 FORD F-150
190,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
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BOOTY
  • MEMBER
  • 1 POST
truck runs rough .. engine light is now on.. computer says cylin 3 and 4 misfires .. replaced egnition coils on 3 and 4 already .. also put new plugs in 2 months ago .. any more sugg thanks
Sep 27, 2014 at 4:22 PM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Have you replaced the two plugs with the new coils? Is the same code turning back on? Have you checked for vacuum leaks? These vehicles are known for a vacuum developing in a hose behind the throttle body that has a 90 degree bend in it. They dry rot and leak. Also, have you checked fuel pump pressure?
Sep 27, 2014 at 6:03 PM
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