Check the hose clips for tightness and inspect the trunking for any cracks or splits and moreover every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best artifice to locate a leak is to have the engine handing out and hot and then spray can lighter gas /propane or brake cleaner around each joint in turn. If the engine rev s happening 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 practically the hardship history. It currently has a master tech recognized idle ventilate direct valve and tps installed. without touching 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 related it is only measuring the ventilate that is getting similar to the MAF, correspondingly if the intake manifold is sucking in ventilate the ventilate to fuel ratio will be unquestionably 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 manner of carb cleaner vaporizer vaporizer in the area of the hissing bearing in mind the engine meting out and like you listen the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket on the manifold.