Originally Posted by
Ls_[eg]hatch
Yup its most likely a vacume leak, Does it idle funny, or run any different?
just start checking every plug or Hose that gets vacume.
YouTube - Honda Civic EX exhaust
This is me, my car, my noise! At the very end of the vid, I shut my car off, and you can hear it near perfectly. EDIT: (Right at 1:34 in the video)
It doesn't idle rough or funny, though sometimes it does idle very low, but that's on sweltering hot days it seems.
Thanks