This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can as a consequence permit the engine to rev up considering not desired causing rasping running. As its a mechanical irregularity it tends not to outlook upon the irregularity open and you can sometimes listen a hissing noise in imitation of 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 get a fast anomaly find if you unplug the meter and manage the engine without it. if the engine condition is the similar later chances are the meter or the connection to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can get coated later than dirt exceeding mature which next offsets the reading. Use some read cleaner or brake cleaner to spray onto the wires to surgically remove the dirt on no account adjoin the wires subsequent to whatever as they are totally fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine be in many factors may cause the similar symptom(s)