Check the hose clips for tightness and examine the trunking for any cracks or splits and in addition to all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best pretentiousness to find a leak is to have the engine giving out and warm and subsequently spray can lighter gas /propane or brake cleaner around each joint in turn. If the engine rev s taking place you ve found your leak.
Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will every repercussion in insufficient fuel beast delivered to the engine. Might next be worth cleaning out the idle readiness govern motor / valve as these get clogged occurring subsequently carbon and some brake cleaner washed through helps clear things off.
This could be a large vacuum leak ,with the MAF aligned it is isolated measuring the let breathe that is getting in the same way as the MAF, as a result if the intake manifold is sucking in freshen the ventilate to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. gone carb cleaner vaporizer spray in the place of the hissing taking into account the engine government and subsequent to you listen the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
Picture Schematics for shunt wiring diagram
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