hello guys...
i'm having similar issues to yours. maybe we all can come up with some kind of answer???

i have '97 f250 5.4 triton. been running rough at crusing speed like you have been describing your trucks doing. idle seems fine. i have posted in the forums, and gotten some very helpful responses like you have, and tried them all... briefly: changed fuel filter, egr vac regulator, air filter, both upstream o2 sensors, all plugs, changed oil, checked visually for egr vac leaks. i have also tried checking sensors (maf, iat, and egr) with multimeter, but my skills in that dept. aren't very advanced, not sure if i am reading the results correctly.
i am still getting error code P0301- cylnd #1 misfire. (bye the way, jiffy lube can read error codes-they just asked me if i am a regular customer and didn't charge me... still gave the kid 10 bucks for the favor.)
i am suspecting the ignition coil packs as read in this post. first, i want to try to check them with multi/voltmeter myself. can anyone give me some direction as to how to correctly do this???

any help and advice will be greatly appreciated. thanks!

 

you may get more responses if you post in the 5.4 forumn, most of us here at the FE forumn dont know much about them computer controlled motors

 

Sorry Brian, I forgot to check before I moved this. It is a duplicate. You can delete it.