Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

some reason there is a hissing sound cumming from near the throttlebody/injector. tried and tried and i cant sort it and neither can my m8s it wont idle and backfires when ticking over so much so it split the plastic inlet manifold!!!! any idea what this could be as iv checked the timing belt far 2 many times and it drove faultles day b 4 it happened,, now my question is will the x16xe inlet etc bolt onto mine using the x16xe throttlebody? can get 1 rather cheap complete lot as the plastic 1 is xtremely hard to find please help any suggestions asap