Now you might think that spraying lighter gas almost a warm engine isnt wise, however the flash /ignition lessening of gas is about 400C appropriately you craving a naked flame or spark to set it off and Ive used this method for many years without incident. perform your pretension through each realistic joint one at a mature and you should locate it. I use a slightly flattened fragment of brake pipe and some rubber hose from the can of lighter gas to have enough money a spraying wand and permit a lecture to blast of gas into each area, especially those difficult to achieve taking into account large implements.
Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick defect find if you unplug the meter and rule the engine without it. if the engine condition is the thesame subsequently chances are the meter or the membership to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated with dirt more than grow old which next offsets the reading. Use some gate cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account lie alongside the wires later all as they are no question fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring 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 in the works and is warmed up? oftentimes in engine perform many factors may cause the similar symptom(s)