Then theresa base idle issue but unless someone has tampered with it there is no reason why it would have changed. I would make sure you have no air leaks anywhere.

It's not your ISCV as you have said the car "Hunts" this shows the ISCV to be working and it would not stop the car from running when hot as it's not used unless a heavy electrical load etc is applied. Normally if this fails the car will be harder to start from cold.

Martin