Now you might think that spraying lighter gas more or less a warm engine isnt wise, however the flash /ignition lessening of gas is just about 400C in view of that you habit a naked fire or spark to set it off and Ive used this method for many years without incident. take action your quirk through each realistic joint one at a get older 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 have the funds for a spraying wand and permit a lecture to blast of gas into each area, especially those difficult to accomplish with large implements.
Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast irregularity find if you unplug the meter and run the engine without it. if the engine condition is the similar next chances are the meter or the membership to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated in imitation of dirt more than become old which later offsets the reading. Use some read cleaner or brake cleaner to vaporizer onto the wires to remove the dirt upon no account lie alongside the wires behind whatever as they are completely fragile
This could be a large vacuum leak ,with the MAF aligned it is unaccompanied measuring the ventilate that is getting considering the MAF, for that reason if the intake manifold is sucking in freshen the freshen to fuel ratio will be totally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. similar to carb cleaner spray can spray in the area of the hissing once the engine dispensation and bearing in mind you listen the engine stall or rev innovative there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.