Hello, I have repaired over 30000 vehicles in my career and I infatuation to question you questions back I am not there in person to accrue facts, data, or to test your vehicle. I may ask you to appear in assay in my stead. If assay is needed and you would rather not work testing, I can give my best advice, Fuel pressure?
Might moreover be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a quick deviation find if you unplug the meter and rule the engine without it. if the engine condition is the similar then chances are the meter or the relationship to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated once dirt more than grow old which next offsets the reading. Use some open cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt on no account touch the wires subsequently anything as they are agreed fragile
This could be a large vacuum leak ,with the MAF partnered it is isolated measuring the air that is getting later the MAF, suitably if the intake manifold is sucking in let breathe the freshen 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. like carb cleaner spray can vaporizer in the area of the hissing when the engine supervision and subsequently you listen the engine stall or rev highly developed there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.