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Pretty sure all these recent idle complaints are due to injectors getting older/used and either getting clogged up or beginning to leak.
Mine is in the shop for something similar and two plugs were black. Ran perfectly fine under load and at WOT, just a bad idle that got worse and worse over the last year. Kind of indicates leaking injectors in those cylinders, leading to rich mixture misfires at idle.
Doing new injectors early this week & will let you all know.
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