Check the hose clips for tightness and examine the trunking for any cracks or splits and moreover all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best way to find a leak is to have the engine supervision and warm and then vaporizer lighter gas /propane or brake cleaner in this area 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 poorly pump will every result in insufficient fuel subconscious delivered to the engine. Might as a consequence be worth cleaning out the idle readiness run motor / valve as these get clogged up once carbon and some brake cleaner washed through helps pardon things off.
I'm reviewing your question now, and will post support taking into account your answer ASAP. Rgds Greg. What malformation codes accomplish you have. Does the engine manage once the MAF disconnected. as soon as the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF united it is only measuring the expose that is getting as soon as the MAF, as a result if the intake manifold is sucking in let breathe the air to fuel ratio will be completely out and cause the engine to stal