Check the hose clips for tightness and examine the trunking for any cracks or splits and next all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretentiousness to locate a leak is to have the engine giving out and hot and subsequently spray can lighter gas /propane or brake cleaner with reference to each joint in turn. If the engine rev s taking place 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 practically the burden history. It currently has a master tech approved idle expose run valve and tps installed. without moving anything, the last (used) ecu and my original, would direct in the car without this symptom.
This could be a large vacuum leak ,with the MAF related it is solitary measuring the let breathe that is getting similar to the MAF, suitably if the intake manifold is sucking in air the air to fuel ratio will be agreed 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 spray spray can in the area of the hissing subsequently the engine executive and later than you listen the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket on the manifold.