Hi just bought 2001 HD F150 after 5 miles misfire started was taken to specialist who fitted coil pack to no 7 . Picked it up fine for 5 miles again then misfire. Can you believe that they fitted a new coil pack with out changing the plug. Fitted newplug myself problem cured. Trouble now got service warning light and noe the truck is 150 miles away from the garage who changed the coils. If you wnt someting done properly do it your self.
Paul
Bristol
England

 

Paul - lookup "Misfire" within this forum , lots of info here.

GoodLuck!!