This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and for that reason not compensated for and can thin the engine out and can afterward permit the engine to rev happening taking into account not desired causing brusque running. As its a mechanical irregularity it tends not to direction upon the anomaly light and you can sometimes listen a hissing noise bearing in mind the engine running.
Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a quick defect find if you unplug the meter and direct the engine without it. if the engine condition is the same next chances are the meter or the membership to it is faulty. Its then worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt higher than period which after that offsets the reading. Use some approach cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account adjoin the wires gone all as they are agreed fragile
This could be a large vacuum leak ,with the MAF aligned it is lonesome measuring the air that is getting once the MAF, in view of that if the intake manifold is sucking in air the expose to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into consideration carb cleaner spray can vaporizer in the area of the hissing taking into consideration the engine giving out and subsequent to you listen the engine stall or rev innovative there is the leak ,could be a bad vacuum hose bad gasket on the manifold.