Check the hose clips for tightness and examine the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine running and hot and after that spray can lighter gas /propane or brake cleaner on the order of each joint in turn. If the engine rev s going on you ve found your leak.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a little more very nearly the misfortune history. It currently has a master tech qualified idle air control valve and tps installed. without moving anything, the last (used) ecu and my original, would govern in the car without this symptom.
This could be a large vacuum leak ,with the MAF amalgamated it is on your own measuring the ventilate that is getting in the same way as the MAF, so if the intake manifold is sucking in let breathe the let breathe to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. like carb cleaner spray spray can in the area of the hissing later the engine handing out and subsequently you hear the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.