Hey guys

My car has a weird little intermittent idle problem that comes and goes. After the car is warmed up, the idle will go funny and bounce up and down from 200rpm - 1200rpm. This happens for a few minutes before it stabilises itself at around 700rpm. This will also happen every so often when coming to a halt at traffic lights but at other times will be just fine.

The car drives perfectly fine without any hiccups and has not been modified in any way either. Motor is a stock B16A.

I've taken off the IACV and gave it a clean but made no difference.

Any ideas guys?