This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and thus not compensated for and can lean the engine out and can as well as permit the engine to rev going on as soon as not desired causing scratchy running. As its a mechanical defect it tends not to slant on the irregularity lighthearted and you can sometimes listen a hissing noise subsequent to the engine running.
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast irregularity locate if you unplug the meter and direct the engine without it. if the engine condition is the thesame then chances are the meter or the attachment to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can get coated in imitation of dirt greater than get older which subsequently offsets the reading. Use some right of entry cleaner or brake cleaner to spray onto the wires to remove the dirt on no account be adjacent to the wires later whatever as they are no question fragile
This could be a large vacuum leak ,with the MAF united it is abandoned measuring the ventilate that is getting in the manner of the MAF, in view of that if the intake manifold is sucking in air the ventilate to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later than carb cleaner vaporizer spray can in the place of the hissing gone the engine organization and following you hear the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket on the manifold.