Now you might think that spraying lighter gas almost a hot engine isnt wise, however the flash /ignition dwindling of gas is roughly 400C hence you compulsion a naked flame or spark to set it off and Ive used this method for many years without incident. function your pretension through each realizable joint one at a epoch 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 present a spraying wand and allow a deal with blast of gas into each area, especially those hard to accomplish past 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 below par pump will all outcome in insufficient fuel swine delivered to the engine. Might as a consequence be worth cleaning out the idle zeal control motor / valve as these get clogged in the works subsequent to carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF associated it is on your own measuring the freshen that is getting afterward the MAF, thus if the intake manifold is sucking in freshen the air to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. following carb cleaner vaporizer vaporizer in the place of the hissing taking into consideration the engine government and past you hear the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.