Hello, I have repaired greater than 30000 vehicles in my career and I habit to ask you questions before I am not there in person to stockpile facts, data, or to exam your vehicle. I may question you to doing breakdown in my stead. If examination is needed and you would rather not ham it up testing, I can come up with the money for 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 attain a fast idiosyncrasy locate if you unplug the meter and direct the engine without it. if the engine condition is the similar then chances are the meter or the attachment to it is faulty. Its plus worth cleaning the MAF sensor wires, as they can get coated subsequently dirt exceeding get older which subsequently offsets the reading. Use some open cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt upon no account touch the wires later than whatever as they are no question fragile
This could be a large vacuum leak ,with the MAF united it is on your own measuring the air that is getting like the MAF, correspondingly if the intake manifold is sucking in ventilate 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. gone carb cleaner spray can vaporizer in the area of the hissing once the engine handing out and in imitation of you hear the engine stall or rev future there is the leak ,could be a bad vacuum hose bad gasket on the manifold.