Running Rough / Close to Stalling

[sd1800]

The ol girl has had a rough running problem for a while now which i put up with but it escalated this afternoon.

Essentially for a while now it has run rough and idled low while cold, would occasionaly come close to stalling but then would come good. On the odd occasion this rough running condition would appear intermittently also while the car was warm but it wasn't as common. Most of the time if I turned the car off for 10 seconds and restarted her she would be good which looks more like a sensor rather than something mechanical ala leaking injectors.

This afternoon the problem was there to stay even when the car was warmed up. Everytime I would pull up to the lights the revs would dip down to around 200rpm but then it would pick itself up but still idled abit low/rough (about 600rpm).

I should mentioned, apart from at idle the car runs well and pulls hard.

What I have done:
New Fuel Filter 12,000km ago
23,000km old platinum plugs
New MSD Leads and Coils
Set TPS to .93v
Cleaned TB 5k ago
cleaned isc 5k ago
cleaned maf 5k ago
New Cam Sync and sensor
New Oxygen sensors

I disconnected the ISC and it was considerably worse (it actually stalled)

I disconnected with car running in park and it made a instant big change to revs which would imply it is working.

Would love any ideas in getting rid of this gremlin!!