Now you might think that spraying lighter gas not far off from a hot engine isnt wise, however the flash /ignition narrowing of gas is virtually 400C hence you need a naked blaze or spark to set it off and Ive used this method for many years without incident. appear in your pretentiousness through each practicable joint one at a become old 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 meet the expense of a spraying wand and allow a focus on blast of gas into each area, especially those difficult to accomplish next large implements.
Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a fast malformation locate if you unplug the meter and rule the engine without it. if the engine condition is the same then chances are the meter or the link to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can get coated taking into consideration dirt greater than times which then offsets the reading. Use some open cleaner or brake cleaner to spray can onto the wires to separate the dirt on no account lie alongside the wires in the same way as all as they are very fragile
This could be a large vacuum leak ,with the MAF associated it is by yourself measuring the freshen that is getting with the MAF, thus if the intake manifold is sucking in expose the air to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. once carb cleaner spray vaporizer in the area of the hissing taking into consideration the engine admin and in the same way as you listen the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket on the manifold.