I did a search, and came across some suggestions, such as bad motor mounts, dirty throttle body, needs tune up, etc. My 91 crx has kind of a rough idle. I just ran a tank of 93 octane(or 91, whatever it is) of Chevron with techron gas through it, with a bottle of the 4 buck STP fuel injector cleaner. It seems to be idling a little smoother. Is there anything else i could try to make it a little smooter, other than running the same gas again with another bottle of fuel injector cleaner, which i just did? I remeber all of the Hondas we've owned had a rough idle when they got older.