I have a 1992 honda civic HB with a d15b. the car seems to hiccup at idle in a non consistant pattern. the car has no accel issues. even if im on it or just plain driving. It dosent hesitate, its never died out or anything just a burbuling noise at idle. i replaced the coil/plugs/wires. no check engine light or anything.

 

heres a link to a video the noise is much more distinct in real life. its at the begging and best heard around 18-20 seconds in. http://www.youtube.com/watch?v=wCcqoprHt3s

 

Hows your oil? Mine seems to do that when my oils low sometimes. Could be a different issue though.

 

just did a oil change on it. ive owned that car for about 4 months and its always done that. it is a vx model and has a swap so maybe when they did the swap something did convert over? idk maybe a ground ould that cause this? it dosent affect the car just something id like to get rid of.