This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and suitably not compensated for and can thin the engine out and can along with allow the engine to rev in the works gone not desired causing severe running. As its a mechanical irregularity it tends not to position on the irregularity blithe and you can sometimes hear a hissing noise in the manner of the engine running.
Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick malformation find if you unplug the meter and run the engine without it. if the engine condition is the same after that chances are the meter or the connection to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated later dirt greater than get older which subsequently offsets the reading. Use some open cleaner or brake cleaner to spray onto the wires to cut off the dirt upon no account lie alongside the wires later anything as they are very fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms occurring and is warmed up? oftentimes in engine piece of legislation many factors may cause the similar symptom(s)