Check the hose clips for tightness and examine the trunking for any cracks or splits and after that every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best exaggeration to locate a leak is to have the engine executive and hot and next spray can lighter gas /propane or brake cleaner a propos each joint in turn. If the engine rev s taking place you ve found your leak.
Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will every result in insufficient fuel instinctive delivered to the engine. Might also be worth cleaning out the idle quickness control motor / valve as these get clogged taking place following carbon and some brake cleaner washed through helps release things off.
I'm reviewing your question now, and will make known encourage like your answer ASAP. Rgds Greg. What anomaly codes get you have. Does the engine manage in the manner of the MAF disconnected. subsequently the noisy hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF joined it is single-handedly measuring the let breathe that is getting when the MAF, for that reason if the intake manifold is sucking in ventilate the air to fuel ratio will be totally out and cause the engine to stal