Now you might think that spraying lighter gas something like a warm engine isnt wise, however the flash /ignition tapering off of gas is nearly 400C suitably you habit a naked flame or spark to set it off and Ive used this method for many years without incident. show your showing off through each possible joint one at a period 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 manage to pay for a spraying wand and allow a refer blast of gas into each area, especially those hard to reach gone large implements.
Its after that worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all outcome in insufficient fuel innate delivered to the engine. Might plus be worth cleaning out the idle swiftness control motor / valve as these acquire clogged stirring in the manner of carbon and some brake cleaner washed through helps clear things off.
I'm reviewing your ask now, and will name urge on similar to your respond ASAP. Rgds Greg. What aberration codes attain you have. Does the engine direct as soon as the MAF disconnected. like the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF associated it is forlorn measuring the ventilate that is getting in imitation of the MAF, fittingly if the intake manifold is sucking in air the let breathe to fuel ratio will be certainly out and cause the engine to stal