Now you might think that spraying lighter gas all but a hot engine isnt wise, however the flash /ignition point of gas is approximately 400C as a result you compulsion a naked ember or spark to set it off and Ive used this method for many years without incident. play your pretension through each possible joint one at a grow old 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 provide a spraying wand and permit a take in hand blast of gas into each area, especially those hard to reach taking into consideration large implements.
Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast oddity find if you unplug the meter and manage the engine without it. if the engine condition is the similar later chances are the meter or the link to it is faulty. Its with worth cleaning the MAF sensor wires, as they can acquire coated following dirt exceeding era which subsequently offsets the reading. Use some gain access to cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account lie alongside the wires like all as they are utterly fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you taking place 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 stirring and is warmed up? oftentimes in engine act out many factors may cause the similar symptom(s)