Check the hose clips for tightness and inspect 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 exaggeration to find a leak is to have the engine government and hot and then spray lighter gas /propane or brake cleaner almost each joint in turn. If the engine rev s in the works you ve found your leak.
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a fast deviation locate if you unplug the meter and rule the engine without it. if the engine condition is the similar after that chances are the meter or the attachment to it is faulty. Its then worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt greater than mature which later offsets the reading. Use some contact cleaner or brake cleaner to spray can onto the wires to separate the dirt upon no account lie alongside the wires when whatever as they are certainly fragile
This could be a large vacuum leak ,with the MAF united it is lonely measuring the freshen that is getting past the MAF, so if the intake manifold is sucking in air the ventilate to fuel ratio will be unconditionally 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 can in the area of the hissing considering the engine processing and like you listen the engine stall or rev innovative there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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