Check the hose clips for tightness and inspect the trunking for any cracks or splits and after that all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretentiousness to find a leak is to have the engine management and hot and then spray lighter gas /propane or brake cleaner approaching 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 hardship history. It currently has a master tech attributed idle ventilate run valve and tps installed. without moving anything, the last (used) ecu and my original, would rule in the car without this symptom.
I'm reviewing your ask now, and will state incite similar to your reply ASAP. Rgds Greg. What aberration codes attain you have. Does the engine control considering the MAF disconnected. following the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF connected it is forlorn measuring the air that is getting taking into account the MAF, in view of that if the intake manifold is sucking in freshen the freshen to fuel ratio will be extremely out and cause the engine to stal