Now you might think that spraying lighter gas something like a warm engine isnt wise, however the flash /ignition tapering off of gas is more or less 400C thus you dependence a naked flame or spark to set it off and Ive used this method for many years without incident. bill your quirk through each practicable joint one at a become old and you should find it. I use a slightly flattened fragment of brake pipe and some rubber hose from the can of lighter gas to offer a spraying wand and allow a take in hand blast of gas into each area, especially those hard to attain later large implements.
Might afterward be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast idiosyncrasy locate if you unplug the meter and control the engine without it. if the engine condition is the thesame then chances are the meter or the connection to it is faulty. Its also worth cleaning the MAF sensor wires, as they can acquire coated in the same way as dirt higher than get older which after that offsets the reading. Use some admittance cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt upon no account touch the wires next anything as they are completely 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 feint many factors may cause the thesame symptom(s)