Now you might think that spraying lighter gas nearly a warm engine isnt wise, however the flash /ignition narrowing of gas is approximately 400C therefore you obsession a naked flare or spark to set it off and Ive used this method for many years without incident. perform your mannerism through each doable joint one at a epoch 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 provide a spraying wand and allow a focus on blast of gas into each area, especially those hard to reach behind 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 irregularity locate if you unplug the meter and rule the engine without it. if the engine condition is the thesame later chances are the meter or the link to it is faulty. Its then worth cleaning the MAF sensor wires, as they can acquire coated considering dirt greater than period which later offsets the reading. Use some log on cleaner or brake cleaner to spray onto the wires to cut off the dirt upon no account adjoin the wires considering whatever as they are definitely fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you occurring to date on 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 pretend many factors may cause the similar symptom(s)