[brucepick]

Thanks guys but sorry, lousy rough idle is back. And the CELs. Seems to be burning oil too. Still getting decent FE as long as I'm not fighting snow, rain or wind.

I've been using Marvel Mystery Oil (MMO) in the crankcase. I read some discussion (on bobistheoilguy.com??) where this thin stuff caused faster consumption but it dropped after discontinuing MMO. The Civic is due for an oil change. This time I'll not add MMO and I might give it fresh plugs (again!) or at least maybe clean an old set with emery cloth.