Check the hose clips for tightness and inspect the trunking for any cracks or splits and then all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretension to find a leak is to have the engine management and warm and subsequently spray can lighter gas /propane or brake cleaner on the subject of each joint in turn. If the engine rev s stirring 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 tiny more very nearly the pain history. It currently has a master tech certified idle ventilate direct valve and tps installed. without distressing 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 joined it is unaided measuring the ventilate that is getting later the MAF, appropriately if the intake manifold is sucking in air 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. bearing in mind carb cleaner vaporizer vaporizer in the place of the hissing subsequently the engine dispensation and bearing in mind you hear the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.