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I'm going to take another guess here, I think the plastic cover over the intake manifold is loose. I took it off a week ago for cleaning and now it has a bit of play in it.
Also took the same 200mi trip back today and it started again a little while after driving in the city. Same sound, happening about 2k rpm, tried to film it but it wasn't picking up over the road noise.
So I'm going to take the cover off, or wrap some electrical tape around the slot to see if it dampens the vibration and holds it together. Will make another post later.
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