Now you might think that spraying lighter gas not far off from a warm engine isnt wise, however the flash /ignition lessening of gas is about 400C fittingly you obsession a naked fire or spark to set it off and Ive used this method for many years without incident. proceed your quirk through each viable joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to present a spraying wand and permit a talk to blast of gas into each area, especially those hard to accomplish past 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 quick irregularity locate if you unplug the meter and direct the engine without it. if the engine condition is the similar next chances are the meter or the connection to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated behind dirt exceeding mature which subsequently offsets the reading. Use some entre cleaner or brake cleaner to spray can onto the wires to cut off the dirt on no account be adjacent to the wires considering anything as they are unconditionally fragile
I'm reviewing your question now, and will declare help gone your respond ASAP. Rgds Greg. What aberration codes do you have. Does the engine direct as soon as the MAF disconnected. next the loud hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is and no-one else measuring the air that is getting later the MAF, consequently if the intake manifold is sucking in expose the let breathe to fuel ratio will be utterly out and cause the engine to stal