cheers for that , ive just been told too unplug the idle control valve aswell when running
and it should stall , if not i have an air leak ,and mine dosent stall, so i have listened around the inlet manifold and yes i can hear hissing around the injectors
been told too renew the rubber o rings around the injectors , have you heard off that before

sorry for the hi jack on post , but it may help your mate out aswell , as i have been told this is a common problem on these cars