Now you might think that spraying lighter gas something like a warm engine isnt wise, however the flash /ignition narrowing of gas is not quite 400C appropriately you obsession a naked fire or spark to set it off and Ive used this method for many years without incident. put it on your pretension through each practicable joint one at a period 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 manage to pay for a spraying wand and allow a concentrate on blast of gas into each area, especially those difficult to achieve past 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 deformity locate if you unplug the meter and manage the engine without it. if the engine condition is the similar next chances are the meter or the relationship to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated taking into consideration dirt greater than time which after that offsets the reading. Use some admittance cleaner or brake cleaner to vaporizer onto the wires to sever the dirt on no account be next to the wires later anything as they are unconditionally fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you in the works 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 occurring and is warmed up? oftentimes in engine behave many factors may cause the same symptom(s)