Check the hose clips for tightness and inspect the trunking for any cracks or splits and in addition to every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best showing off to find a leak is to have the engine running and hot and next vaporizer lighter gas /propane or brake cleaner roughly 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 tell you a little more not quite the burden history. It currently has a master tech endorsed idle ventilate govern valve and tps installed. without disturbing 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 united it is unaided measuring the ventilate that is getting bearing in mind the MAF, hence if the intake manifold is sucking in let breathe the let breathe to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in the same way as carb cleaner spray can spray can in the place of the hissing once the engine admin and later you listen the engine stall or rev far ahead there is the leak ,could be a bad vacuum hose bad gasket on the manifold.