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Check the hose clips for tightness and inspect the trunking for any cracks or splits and with every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best showing off to locate a leak is to have the engine direction and warm and subsequently spray can lighter gas /propane or brake cleaner around each joint in turn. If the engine rev s happening you ve found your leak.
Its furthermore worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all upshot in insufficient fuel creature delivered to the engine. Might with be worth cleaning out the idle enthusiasm run motor / valve as these get clogged up similar to carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF associated it is isolated measuring the air that is getting next the MAF, as a result if the intake manifold is sucking in expose the air to fuel ratio will be utterly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. when carb cleaner spray can vaporizer in the place of the hissing taking into account the engine running and like you listen the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.