Now you might think that spraying lighter gas roughly speaking a warm engine isnt wise, however the flash /ignition dwindling of gas is about 400C consequently you infatuation a naked flame or spark to set it off and Ive used this method for many years without incident. be in your way through each possible joint one at a times and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to come up with the money for a spraying wand and permit a refer blast of gas into each area, especially those hard to attain with large implements.
Might as well as be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a fast anomaly find if you unplug the meter and direct the engine without it. if the engine condition is the thesame later chances are the meter or the membership to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt on top of era which next offsets the reading. Use some get into cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt on no account lie alongside the wires in imitation of anything as they are unconditionally 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 going on and is warmed up? oftentimes in engine affect many factors may cause the similar symptom(s)