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 thin the engine out and can also allow the engine to rev occurring later than not desired causing argumentative running. As its a mechanical oddity it tends not to aim upon the oddity spacious and you can sometimes listen a hissing noise past the engine running.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a quick deformity locate if you unplug the meter and govern the engine without it. if the engine condition is the thesame then chances are the meter or the membership to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can get coated taking into account dirt over become old which next offsets the reading. Use some gain access to cleaner or brake cleaner to spray can onto the wires to remove the dirt on no account touch the wires once anything as they are enormously fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on to date upon all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms taking place and is warmed up? oftentimes in engine decree many factors may cause the thesame symptom(s)