Ok so I have an 2008 Ford F-150 that starts this hard shaking if your going 40mph. The thing is, if your going below 40 or above 40 it doesn't shake. The check engine light is on and when I had it hooked up it said cylinder 5 misfire and something about oxygen. I changed the whole spark plug setup for cylinder 5 but it's still shaking and engine light on. Any ideas about what it could be? I'm so close to paying the truck off so go figure something would go wrong!
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