Check the hose clips for tightness and examine the trunking for any cracks or splits and after that all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best artifice to find a leak is to have the engine management and hot and then spray can lighter gas /propane or brake cleaner approximately 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 tiny more very nearly the misfortune history. It currently has a master tech ascribed idle expose direct valve and tps installed. without moving anything, the last (used) ecu and my original, would manage in the car without this symptom.
This could be a large vacuum leak ,with the MAF amalgamated it is lonely measuring the air that is getting later than the MAF, correspondingly if the intake manifold is sucking in freshen the air to fuel ratio will be certainly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. as soon as carb cleaner spray spray in the area of the hissing taking into consideration the engine organization and in imitation of you listen the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.