Hello, I have repaired higher than 30000 vehicles in my career and I compulsion to question you questions since I am not there in person to accrue facts, data, or to exam your vehicle. I may question you to do something scrutiny in my stead. If breakdown is needed and you would rather not be in testing, I can have the funds for my best advice, Fuel pressure?
Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a fast malformation find if you unplug the meter and run the engine without it. if the engine condition is the same after that chances are the meter or the connection to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can get coated following dirt greater than mature which after that offsets the reading. Use some entry cleaner or brake cleaner to vaporizer onto the wires to sever the dirt upon no account touch the wires in the same way as anything as they are unquestionably fragile
This could be a large vacuum leak ,with the MAF connected it is only measuring the freshen that is getting similar to the MAF, correspondingly if the intake manifold is sucking in air the expose to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. bearing in mind carb cleaner vaporizer spray in the area of the hissing in imitation of the engine giving out and past you hear the engine stall or rev forward-thinking there is the leak ,could be a bad vacuum hose bad gasket on the manifold.