Hello, I have repaired exceeding 30000 vehicles in my career and I habit to ask you questions before I am not there in person to stockpile facts, data, or to exam your vehicle. I may question you to play-act laboratory analysis in my stead. If chemical analysis is needed and you would rather not doing testing, I can come up with the money for my best advice, Fuel pressure?
Might afterward be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a quick oddity find if you unplug the meter and control the engine without it. if the engine condition is the same later chances are the meter or the membership to it is faulty. Its then worth cleaning the MAF sensor wires, as they can get coated taking into account dirt higher than get older which next offsets the reading. Use some get into cleaner or brake cleaner to vaporizer onto the wires to sever the dirt upon no account adjoin the wires subsequently everything as they are unquestionably fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening 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 going on and is warmed up? oftentimes in engine pretense many factors may cause the similar symptom(s)