I've got a FRST with a irratic idle problem so far I have had new spark plugs, new leads, new air filter, cleaned the Idle Speed Control Valve and checked for air leaks, new crank case sensor, however the idle is still not smooth.If I disconnect the ISCV and let the car run on base idle it still has irratic idle, this is the same when I unplug the TPS, any help before I go mad.

car mods

magnex exhaust
k&n and thats it