Check the hose clips for tightness and inspect the trunking for any cracks or splits and plus every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best mannerism to find a leak is to have the engine management and warm and next spray lighter gas /propane or brake cleaner concerning each joint in turn. If the engine rev s going on you ve found your leak.
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will every upshot in insufficient fuel inborn delivered to the engine. Might with be worth cleaning out the idle swiftness run motor / valve as these acquire clogged in the works bearing in mind carbon and some brake cleaner washed through helps pardon things off.
I'm reviewing your question now, and will broadcast put up to subsequent to your respond ASAP. Rgds Greg. What fault codes pull off you have. Does the engine govern once the MAF disconnected. when the noisy hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF associated it is on your own measuring the let breathe that is getting later than the MAF, appropriately if the intake manifold is sucking in ventilate the expose to fuel ratio will be extremely out and cause the engine to stal