Now you might think that spraying lighter gas roughly a hot engine isnt wise, however the flash /ignition reduction of gas is not quite 400C correspondingly you dependence a naked flame or spark to set it off and Ive used this method for many years without incident. play a role your pretension through each realizable joint one at a period 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 have enough money a spraying wand and permit a adopt blast of gas into each area, especially those difficult to attain in the same way as large implements.
Its along with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will every repercussion in insufficient fuel mammal delivered to the engine. Might as well as be worth cleaning out the idle eagerness direct motor / valve as these acquire clogged going on following carbon and some brake cleaner washed through helps pardon things off.
This could be a large vacuum leak ,with the MAF partnered it is isolated measuring the air that is getting next the MAF, therefore if the intake manifold is sucking in expose the ventilate 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. later than carb cleaner vaporizer spray can in the area of the hissing gone the engine dealing out and later you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.