av got a zetec turbo useing a cossie throttle body do i need to have the idle speed control valve or could i just block it off?
i have pectel t2 if that makes a difference?

 

It would be best to have some form of idle speed control valve somewhere, but a lot don't, will just be very lumpy idle when cold etc, and have to hold it on throttle manually a lot.
You could use a cossie one or another one in a different position.
tabetha

 

as tabetha said its best to have one fitted makes driving a lot easier id use the cossie one

 

tar peeps

 

i'm using one on my zetec turbo so it runs smoother as the other guys have mentioned but have gone for fiesta turbo one so i can mount it out the way as the cossie iscv gets in the way on my set up.
Good luck