Hello, I have repaired beyond 30000 vehicles in my career and I habit to question you questions before I am not there in person to store up facts, data, or to test your vehicle. I may question you to pretense psychiatry in my stead. If chemical analysis is needed and you would rather not be active testing, I can offer my best advice, Fuel pressure?
Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast deformity find if you unplug the meter and direct the engine without it. if the engine condition is the same subsequently chances are the meter or the relationship to it is faulty. Its plus worth cleaning the MAF sensor wires, as they can get coated bearing in mind dirt greater than era which next offsets the reading. Use some right to use cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account adjoin the wires with everything as they are no question fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on to date on all 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 show many factors may cause the same symptom(s)