Found a cheap alternative for the ERR4352 IAC's on Ebay Recently....
BRAND NEW IDLE AIR CONTROL VALVE **FITS 2.5L L4 & 4.0 L6 IAC MOTOR | eBay

I bought a couple, fitted one today and everything seems fine...Idle was a bit wonky/stumbly before and fitted this and after a quick "acclimatisation" drive everything is great.