Now you might think that spraying lighter gas with reference to a hot engine isnt wise, however the flash /ignition point of gas is very nearly 400C suitably you need a naked ember or spark to set it off and Ive used this method for many years without incident. conduct yourself your pretension through each practicable joint one at a grow old and you should locate it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to present a spraying wand and permit a direct blast of gas into each area, especially those hard to accomplish next large implements.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a quick defect find if you unplug the meter and manage the engine without it. if the engine condition is the same 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 acquire coated as soon as dirt more than epoch which after that offsets the reading. Use some retrieve cleaner or brake cleaner to spray can onto the wires to separate the dirt on no account be adjacent to the wires bearing in mind anything as they are totally fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you taking place 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 conduct yourself many factors may cause the same symptom(s)