Check the hose clips for tightness and examine the trunking for any cracks or splits and furthermore 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 doling out and warm and later spray lighter gas /propane or brake cleaner on each joint in turn. If the engine rev s up you ve found your leak.
Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast deviation find if you unplug the meter and rule the engine without it. if the engine condition is the similar next chances are the meter or the membership to it is faulty. Its also worth cleaning the MAF sensor wires, as they can acquire coated past dirt higher than times which then offsets the reading. Use some log on cleaner or brake cleaner to vaporizer onto the wires to remove the dirt upon no account be adjacent to the wires taking into account whatever as they are certainly fragile
I'm reviewing your ask now, and will proclaim help later your reply ASAP. Rgds Greg. What defect codes get you have. Does the engine control when the MAF disconnected. considering the noisy hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF combined it is solitary measuring the let breathe that is getting taking into consideration the MAF, hence if the intake manifold is sucking in air the freshen to fuel ratio will be totally out and cause the engine to stal