June 12, 20186 yr comment_550927 I'm guessing he got it fixed? But I think the dark plugs are most likely the old ones from 4 turns down? Link to comment https://www.classiczcars.com/forums/topic/59710-idle-doesnt-decrease-sometimes-surges-when-shifting/?&page=2#findComment-550927 Share on other sites More sharing options...
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