When I change my NGK nickel sparkplugs out @ 30k miles, the TBs have to be removed, so that is when I clean them. As said previously in post 30, IF you dump your side valve cover crankcase breathers, not the PCV lines, to atmosphere (like me) or into a catch can the TBs won't become as contaminated w/carbon from blow-by. I would buy new PCVs (11810-EY00A) and PCV insulators (11812-6N200) at 90k miles on the OD.
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