Well although outside of those approximate figures It appears to be working, the cold reading is close enough, the hot reading is quite a bit different but the fault is there regardless of temperature or in open or closed loop, the only vac pipe I havent checked is the one down the back of the throttle body that goes to some sort of sensor associated with the aircon system, as I cant pinpoint a direct source for the said PITA suspected vac leak im beginning to think either the throttle body seal or the inlet manifold seal maybe, think its gonna have to come off