Check the hose clips for tightness and examine the trunking for any cracks or splits and after that every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best showing off to locate a leak is to have the engine processing and warm and later vaporizer lighter gas /propane or brake cleaner concerning 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 tiny more virtually the difficulty history. It currently has a master tech endorsed idle freshen run valve and tps installed. without disturbing anything, the last (used) ecu and my original, would rule in the car without this symptom.
This could be a large vacuum leak ,with the MAF associated it is lonely measuring the freshen that is getting with the MAF, as a result if the intake manifold is sucking in expose the ventilate to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. once carb cleaner vaporizer vaporizer in the area of the hissing once the engine supervision and as soon as you hear the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.