Thanks for this information!
My idle is not as rough as it used to be, here and there it acts weird and minor vibes, I did replace all 6 coils and plugs and MAF this past summer. No difference really. A hair smoother but at least that part of the maintenance is out of the way.
As soon as it get a bit warmer out i without a doubt will pull the cover off and grease up them coils.
You may have discovered a cure for a lot of people with symptoms they never could remedy.