Bouncy Idle
 

I've been wondering lately why my 1990 Prelude has a bouncy idle, along
with a strange high-RPM idle while in motion. (Shift into neutral and
coast; regardless of speed, it will "idle" at 2000-2500RPM until I come
to a complete stop. Then it will start bouncing) When the idle
bounces, it usually bounces between 500-750RPMs, and does this
rhythmically about every second or two. I had read on www.prelude3g.com
that the fast-idle valve can contribute to bouncy idle, and the car can
function without the device. (Granted, you have to plug the holes,
which I did. I checked, and they are air-tight) I also checked the
vacuum lines that go from the control box to the throttle body, and they
are all connected correctly. This leaves the EACV as the culprit,
unless the wealth of Honda knowledge out there can enlighten me as to
what else could be the cause of this annoyance. Any ideas and/or
suggestions will be appreciated.

Thanks in advance! :-)

Jon

P.S. My engine is the JDM B20A; manual transmission.