Now you might think that spraying lighter gas not far off from a warm engine isnt wise, however the flash /ignition tapering off of gas is about 400C appropriately you dependence a naked flare or spark to set it off and Ive used this method for many years without incident. take steps your exaggeration through each viable joint one at a times 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 present a spraying wand and allow a attend to blast of gas into each area, especially those hard to reach with large implements.
Might with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast idiosyncrasy find if you unplug the meter and direct the engine without it. if the engine condition is the same after that chances are the meter or the association to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can get coated in imitation of dirt higher than get older which later offsets the reading. Use some admittance cleaner or brake cleaner to spray can onto the wires to remove the dirt upon no account lie alongside the wires next whatever as they are completely fragile
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