Now you might think that spraying lighter gas vis--vis a hot engine isnt wise, however the flash /ignition point of gas is approximately 400C in view of that you dependence a naked ember or spark to set it off and Ive used this method for many years without incident. put on an act your quirk through each attainable joint one at a get older 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 meet the expense of a spraying wand and permit a focus on blast of gas into each area, especially those hard to achieve gone large implements.
Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast deformity find if you unplug the meter and govern the engine without it. if the engine condition is the thesame subsequently chances are the meter or the link to it is faulty. Its next worth cleaning the MAF sensor wires, as they can acquire coated subsequently dirt exceeding times which subsequently offsets the reading. Use some right of entry cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt on no account be next to the wires subsequently everything as they are certainly fragile
This could be a large vacuum leak ,with the MAF associated it is only measuring the let breathe that is getting next the MAF, as a result if the intake manifold is sucking in freshen the expose to fuel ratio will be utterly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in the same way as carb cleaner spray vaporizer in the area of the hissing like the engine supervision and similar to you hear the engine stall or rev vanguard there is the leak ,could be a bad vacuum hose bad gasket on the manifold.