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Can anyone help me out a little on this please. it has the 5.4 in it. has all new motorcraft plugs. a while ago i had a check engine light and it was for a #5 cyl. misfire. replaced all plugs and the #5 coil pack and ran great. several months later it is idling rought again and if it sits for a while and you go to start it, it cranks alot before she starts. but after that it starts fine. vehicle runs good just driving it, just idles a little rough when you ate stopped. No check engine lights at this time. Has there been issues with the fuel pumps or injectors on these motors? any help is greatly appreciated. also if it is a injector or fuel pump problem for the hard start , will my powertrain cover this. vehicle has 66,000 miles.

Thanks