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I'd leave the coils alone and replace only when needed. Cool thing is, this is one item that you'll get a pretty definitive code for, pointing you to the offending cylinder.
As an aside, if your plugs are old, replace them, along with tubes and o-rings. You can inspect your coils for cracks at the same time. Thing is, plugs, tubes and rings are cheap compared to wholesale change of 6b coils.
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