Check the hose clips for tightness and examine the trunking for any cracks or splits and moreover every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine paperwork and hot and next vaporizer lighter gas /propane or brake cleaner a propos 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 say you a little more just about the suffering history. It currently has a master tech attributed idle freshen direct valve and tps installed. without upsetting anything, the last (used) ecu and my original, would run in the car without this symptom.
I'm reviewing your question now, and will publish support later your reply ASAP. Rgds Greg. What anomaly codes get you have. Does the engine control past the MAF disconnected. as soon as the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF related it is deserted measuring the air that is getting later than the MAF, therefore if the intake manifold is sucking in ventilate the freshen to fuel ratio will be unconditionally out and cause the engine to stal