DSM guys

[Rocket Power]

My brother has a 92 Non-turbo Eclipse and it has a surging idle when cold, not throwing any check engine light. Is there any common that goes wrong that would cause this?

[WhatsADSM]

IIRC there is a base idle set screw somewhere on the throttle body side of the intake manifold. Check that first to make sure it is set correctly.

[wikked]

Picture of the BISS here:
(It has a black rubber seal over it, bottom right-ish corner of the throttle body)
http://www.dsmtuners.com/forums/attachments/newbie-forum/71203d1170115253-resolved-biss-screw-part-number-merged-8-8-tb.jpg

BISS o-ring may be leaking as well:
https://www.slowboyracing.com/product.php?productid=3752

[Rocket Power]

Thanks guys, what's the correct setting, am I looking for an rpm or a screw position or... ?

[LIL EVO]

"common" idle surge between 700-1300 rpm is the ISC motor on the bottom back of the throttle body.

http://vfaq.com/mods/wayback/BradBauer/engine/surge.html