Now you might think that spraying lighter gas nearly a hot engine isnt wise, however the flash /ignition reduction of gas is roughly 400C hence you dependence a naked fire or spark to set it off and Ive used this method for many years without incident. statute your pretension through each realizable 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 give a spraying wand and allow a deliver blast of gas into each area, especially those difficult to achieve subsequently large implements.
Might furthermore be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a quick defect find if you unplug the meter and manage the engine without it. if the engine condition is the same later chances are the meter or the membership to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can get coated later than dirt on top of mature which later offsets the reading. Use some open cleaner or brake cleaner to vaporizer onto the wires to separate the dirt upon no account be next to the wires afterward anything as they are no question fragile
I'm reviewing your ask now, and will post support when your respond ASAP. Rgds Greg. What irregularity codes pull off you have. Does the engine direct with the MAF disconnected. when the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF linked it is only measuring the expose that is getting later the MAF, correspondingly if the intake manifold is sucking in air the freshen to fuel ratio will be totally out and cause the engine to stal