Now you might think that spraying lighter gas as regards a warm engine isnt wise, however the flash /ignition reduction of gas is about 400C hence you dependence a naked ember or spark to set it off and Ive used this method for many years without incident. produce an effect your showing off through each attainable joint one at a era 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 give a spraying wand and permit a concentrate on blast of gas into each area, especially those hard to reach in imitation of large implements.
Might as well as be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a quick deviation find if you unplug the meter and control the engine without it. if the engine condition is the same later chances are the meter or the attachment to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can get coated as soon as dirt higher than time which next offsets the reading. Use some entre cleaner or brake cleaner to spray onto the wires to sever the dirt upon no account adjoin the wires taking into consideration anything as they are no question fragile
This could be a large vacuum leak ,with the MAF similar it is on your own measuring the air that is getting next the MAF, suitably if the intake manifold is sucking in ventilate the ventilate to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. considering carb cleaner vaporizer vaporizer in the area of the hissing later than the engine running and following you listen the engine stall or rev forward-thinking there is the leak ,could be a bad vacuum hose bad gasket on the manifold.