Odd idle when cold?

[Conor D]

On cold starts my idle seems to dip below normal when I put in the clutch, sort of like the car's going to die out but it never does - it doesn't fall that much.

Is this a known issue?

[scrwright]

Give your IAC valve a clean out, could be reacting slowly.

[Sbloxxy]

Also worth re-setting the idle speed properly.

[Max M4X WW]

Mine has an odd idle full stop and I know the car had a new battery before being stood for a couple of months.

I've read this: http://www.miata.net/garage/isc.html

But it looks confusing!