Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best quirk to find a leak is to have the engine dealing out and warm and subsequently spray lighter gas /propane or brake cleaner on each joint in turn. If the engine rev s in the works you ve found your leak.
Its as well as worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will every consequences in insufficient fuel instinctive delivered to the engine. Might moreover be worth cleaning out the idle zeal govern motor / valve as these get clogged going on similar to carbon and some brake cleaner washed through helps clear things off.
I'm reviewing your question now, and will publish support once your respond ASAP. Rgds Greg. What irregularity codes reach you have. Does the engine control when the MAF disconnected. past the loud hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is by yourself measuring the let breathe that is getting past the MAF, for that reason if the intake manifold is sucking in freshen the freshen to fuel ratio will be unconditionally out and cause the engine to stal