Thanks for your input. Thats exactly what i was looking for. Javal the factory vacuum distribution manifold thing is deleted by using the t3 manifold. The reason i was looking into running the iscv is because i was unsure how it would idle with just fuel enrichment when cold as ive never had itb's before and im not real keen on sitting in my car with my foot on the throttle until its warm and idles by itself. I should of added that i am running 272 degree toda cams on a ported smallport so unsure if it will produce enough vacuum to tune with a map. I dont think the lift is massive because its still got shim over bucket setup but i can try with map. I will be also running an iat sensor. Javal i understand your comment about not having enough vacuum for the brake boosted thats why im proposing to just use iacv for cold starts. Im not familiar with tuning ecu's but with the idle control running in closed loop i would imagine the ecu would have a target rpm and actual rpm and just adjust the stepper automatically. Thanks again for your help and if you can think of anything else please keep the comments coming. Cheers, Trent