Sup All, I got a 1990 civic hatchback. Did a complete tune-up, went in to take emmissions, everything is fine except to high of hydrocarbons any suggestions on what i could do to reduce mah Hydrocarbons while idling??

 

If you need to lower it to pass, then fill your tank with the highest grade gas you can get (something like 93) . Run atleast a tank through your system before going back. That should be a quick fix for now... but wont fix it for more than a week or so.