Check the hose clips for tightness and inspect the trunking for any cracks or splits and then all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best mannerism to find a leak is to have the engine executive and warm and next spray lighter gas /propane or brake cleaner with reference to each joint in turn. If the engine rev s up 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 more or less the misery history. It currently has a master tech endorsed idle freshen control valve and tps installed. without heartwarming 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 abandoned measuring the freshen that is getting taking into consideration the MAF, for that reason if the intake manifold is sucking in freshen the ventilate 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. with carb cleaner spray vaporizer in the area of the hissing next the engine executive and in the same way as you hear the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.