Breather modification for the 20XE
i know it says pre-ecotec, but i am experiencing problems similar to those stated. i've got a k&n panel filter.
i've done the ecotec idling problems procedure, and although it has improved things, they are not really perfect.
i haven't cleaned the idle valve (gonna do it this w/e), but it's a fairly new one, so i don't believe it's the problem.