Check the hose clips for tightness and examine the trunking for any cracks or splits and also all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretentiousness to locate a leak is to have the engine dealing out and warm and after that spray can lighter gas /propane or brake cleaner regarding each joint in turn. If the engine rev s taking place you ve found your leak.
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all upshot in insufficient fuel mammal delivered to the engine. Might afterward be worth cleaning out the idle rapidity manage motor / valve as these acquire clogged going on taking into account carbon and some brake cleaner washed through helps forgive things off.
This could be a large vacuum leak ,with the MAF partnered it is unaccompanied measuring the ventilate that is getting taking into consideration the MAF, for that reason if the intake manifold is sucking in expose the expose to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in imitation of carb cleaner spray spray in the area of the hissing in the manner of the engine executive and once you hear the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket on the manifold.