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 lean the engine out and can then permit the engine to rev taking place once not desired causing severe running. As its a mechanical oddity it tends not to direction upon the irregularity buoyant and you can sometimes listen a hissing noise when the engine running.
Might moreover be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a fast malfunction find if you unplug the meter and direct the engine without it. if the engine condition is the same later chances are the meter or the connection to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can get coated in the manner of dirt higher than grow old which later offsets the reading. Use some gain access to cleaner or brake cleaner to spray onto the wires to remove the dirt upon no account touch the wires next all as they are extremely fragile
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