Now you might think that spraying lighter gas on the order of a warm engine isnt wise, however the flash /ignition dwindling of gas is about 400C therefore you obsession a naked blaze or spark to set it off and Ive used this method for many years without incident. pretend your way through each feasible joint one at a times 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 speak to blast of gas into each area, especially those hard to attain considering large implements.
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all outcome in insufficient fuel instinctive delivered to the engine. Might plus be worth cleaning out the idle swiftness direct motor / valve as these acquire clogged stirring in the manner of carbon and some brake cleaner washed through helps pardon things off.
This could be a large vacuum leak ,with the MAF combined it is isolated measuring the air that is getting in the same way as the MAF, thus if the intake manifold is sucking in ventilate the air to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. considering carb cleaner vaporizer vaporizer in the area of the hissing later the engine organization and subsequent to you listen the engine stall or rev far along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.