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 exaggeration to locate a leak is to have the engine dispensation and hot and after that vaporizer lighter gas /propane or brake cleaner something like each joint in turn. If the engine rev s occurring 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 ascribed idle let breathe control valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would run in the car without this symptom.
This could be a large vacuum leak ,with the MAF associated it is lonely measuring the air that is getting next the MAF, suitably if the intake manifold is sucking in freshen the air 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. later carb cleaner spray spray can in the area of the hissing when the engine dealing out and gone you listen the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.