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Message: <blockquote data-quote="rschap1" data-source="post: 2107249" data-attributes="member: 60507">I just replaced plugs and coils on 2011 5.4 Expedition.Making some pretty awful noises, couple different ones.Did plugs and coils yesterday after making a video of the engine running.Didn't notice the arcing while under the hood.But inside the house watching video could see it.Somewhat better after those, but still making nasty noises.I see most exhaust manifold studs gone now.Thinking that is making a lot of clattering and knocking noise too.Weather is getting better so I can wrench more soon.</blockquote>