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 showing off to find a leak is to have the engine government and warm and subsequently vaporizer lighter gas /propane or brake cleaner in relation to each joint in turn. If the engine rev s occurring you ve found your leak.
Its after that worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not a hundred percent pump will all upshot in insufficient fuel living thing delivered to the engine. Might along with be worth cleaning out the idle keenness manage motor / valve as these acquire clogged occurring taking into consideration carbon and some brake cleaner washed through helps release things off.
I'm reviewing your question now, and will declare assist later than your respond ASAP. Rgds Greg. What malformation codes accomplish you have. Does the engine control considering the MAF disconnected. behind the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF similar it is unaided measuring the ventilate that is getting gone the MAF, appropriately if the intake manifold is sucking in expose the air to fuel ratio will be unquestionably out and cause the engine to stal