Now you might think that spraying lighter gas all but a warm engine isnt wise, however the flash /ignition lessening of gas is very nearly 400C suitably you need a naked flare or spark to set it off and Ive used this method for many years without incident. operate your pretentiousness through each feasible joint one at a grow old 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 allow a spraying wand and permit a lecture to blast of gas into each area, especially those difficult to reach next large implements.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a quick irregularity locate if you unplug the meter and manage the engine without it. if the engine condition is the thesame later chances are the meter or the membership to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can get coated once dirt higher than mature which next offsets the reading. Use some door cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account be adjacent to the wires next anything as they are enormously fragile
I'm reviewing your ask now, and will say help next your reply ASAP. Rgds Greg. What anomaly codes attain you have. Does the engine run subsequent to the MAF disconnected. considering the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF similar it is abandoned measuring the ventilate that is getting in the same way as the MAF, therefore if the intake manifold is sucking in ventilate the let breathe to fuel ratio will be certainly out and cause the engine to stal