sorry guys made a slight mistake removed the dump valve and it is a dv26 on the car not a dv 24. as a matter of testing i have removed the dump valve and we have replaced it with a friends baileys dump valve later model than mine, still has same problem allthough seems to happen less often, may just be one of those things however i believe to clean the idle control valve on throttle body you need to remove the starter motor? anyone know if that is correct? thanks again