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Q: i have what seems like a skip in my engine when i'm throttling around 50 mph. on 2007 Ford Expedition

fills like a misfire but the vehicle isn't reading any codes or anything. but when i put injector cleaner in it, it runs fine for a while. i've had the injectors cleaned and a new fuel filter but the problem resurfaces after about 2 or three 3 days
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poss vac leak. is idle slightly higher than normal. if not read live data and it will show misfire info
I'd suspect boots between your plugs and coils. Set about $35 bucks at your local auto parts store. I can tell you these motors eat coils. If boots don't fix maybe just buy one coil (about $42)and alternate starting new one on cylinder #1 and change throughout through #8 and see if somewhere you find problem. Good luck with all rear cylinders cuz there difficult to reach! Maybe start with #1 then #2 then #5 then #6- hopefully you'll find on one of front cylinders.
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