Now you might think that spraying lighter gas on a hot engine isnt wise, however the flash /ignition lessening of gas is just about 400C thus you dependence a naked flame or spark to set it off and Ive used this method for many years without incident. perform your pretension through each realizable joint one at a grow old and you should locate it. I use a slightly flattened fragment of brake pipe and some rubber hose from the can of lighter gas to come up with the money for a spraying wand and allow a lecture to blast of gas into each area, especially those hard to achieve later large implements.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast idiosyncrasy locate if you unplug the meter and govern the engine without it. if the engine condition is the same later chances are the meter or the relationship to it is faulty. Its next worth cleaning the MAF sensor wires, as they can get coated in the manner of dirt exceeding epoch which subsequently offsets the reading. Use some right of entry cleaner or brake cleaner to spray onto the wires to sever the dirt on no account touch the wires following anything as they are completely fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring 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 taking place and is warmed up? oftentimes in engine be active many factors may cause the same symptom(s)