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Check the hose clips for tightness and inspect the trunking for any cracks or splits and as well as every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best exaggeration to find a leak is to have the engine dispensation and warm and later spray lighter gas /propane or brake cleaner roughly each joint in turn. If the engine rev s in the works you ve found your leak.
Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will every outcome in insufficient fuel inborn delivered to the engine. Might as well as be worth cleaning out the idle enthusiasm rule motor / valve as these get clogged in the works in the same way as carbon and some brake cleaner washed through helps free things off.
I'm reviewing your question now, and will pronounce help with your respond ASAP. Rgds Greg. What fault codes complete you have. Does the engine govern following the MAF disconnected. later the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is only measuring the freshen that is getting later the MAF, fittingly if the intake manifold is sucking in freshen the air to fuel ratio will be totally out and cause the engine to stal