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i have 2005 5.4 with a number 3 miss fire and replced the coil and plug also but still on when in 3rd gear going down the highway only?compressions good good injector flow!maybe sticky valves?
hi i think i need your help if you are willing.....i have a 2006 f150 w/4.6.......engine light came on and got it checked....cyc 3 coil pack.... replaced it and all the spark plugs now have slugish starts and rough idle and start speed........ help please i love my truck