98 Festiva Idle Issue

[honer]

Well my new daily driver has a slight issue... At idle, sometimes the idle will just suddenly drop, however usually recovers itself.. Unless headlights/aircon etc are on, then it dies

So I figure I applyV8 Falcon logic here, and assume in thes ISC. So I unplugged to see what it was doing.

Now I've plugged it back in, the engine is idling at about 2000rpm !

Any ideas ? Is it the ISC valve ?