Now you might think that spraying lighter gas approaching a warm engine isnt wise, however the flash /ignition lessening of gas is very nearly 400C suitably you obsession a naked flare or spark to set it off and Ive used this method for many years without incident. play your habit 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 dispatch blast of gas into each area, especially those difficult to reach afterward large implements.
Might moreover be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a quick defect 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 attachment to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated taking into consideration dirt higher than grow old which subsequently offsets the reading. Use some door cleaner or brake cleaner to spray can onto the wires to sever the dirt upon no account adjoin the wires gone everything as they are certainly fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up 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 taking place and is warmed up? oftentimes in engine enactment many factors may cause the similar symptom(s)