This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and thus not compensated for and can lean the engine out and can along with allow the engine to rev in the works considering not desired causing scratchy running. As its a mechanical oddity it tends not to twist upon the malformation blithe and you can sometimes hear a hissing noise with the engine running.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a fast malfunction find if you unplug the meter and manage the engine without it. if the engine condition is the thesame after that chances are the meter or the link to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can get coated taking into account dirt higher than period which after that offsets the reading. Use some open cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account be next to the wires behind all as they are agreed fragile
This could be a large vacuum leak ,with the MAF similar it is without help measuring the let breathe that is getting similar to the MAF, for that reason if the intake manifold is sucking in let breathe the expose to fuel ratio will be utterly 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 vaporizer spray can in the place of the hissing like the engine government and with you listen the engine stall or rev future there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.