I have exactly the same problem as you. Where my car wasn't in use for a year and have exactly the same symptoms as you.
been to busy sorting other stuff lately but have this to fix soon.
As said above I have been told these are things to look at:
ISV - turn the ignition on but not the engine and listen to hear if the ISV buzzes (it will only be faint)
VAC hoses - sounds like you have done two but the important one is the one that goes into the bulkhead and upto the ECU.... take out the ECU side scuttle cover and you will see it go up to the side of the ECU you can't see (helpful!!!) so just take the ECU off its cradle and change it... been told this is important
Relays as said above
Micro switch on the bulkhead side of the throttle body - check with a mutli meter that it is working you can also hear it come in contact when the switch closes there is a click...
Clean the ISV (can't remember if you said you had done this) use carb cleaner and soak it.....
I have yet to do the relays or the ECU vac hose.... think my micro switch is working though.....
let me know how you get on as think its the same thing broken on both of our cars
