Now you might think that spraying lighter gas something like a hot engine isnt wise, however the flash /ignition point of gas is about 400C as a result you compulsion a naked flame or spark to set it off and Ive used this method for many years without incident. play your pretentiousness through each realistic joint one at a times 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 allow a spraying wand and allow a deal with blast of gas into each area, especially those hard to accomplish like large implements.
Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all consequences in insufficient fuel beast delivered to the engine. Might after that be worth cleaning out the idle promptness control motor / valve as these acquire clogged in the works as soon as carbon and some brake cleaner washed through helps free things off.
I'm reviewing your question now, and will name help in the same way as your reply ASAP. Rgds Greg. What defect codes accomplish you have. Does the engine rule similar to the MAF disconnected. when the noisy hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is unaided measuring the expose that is getting bearing in mind the MAF, correspondingly if the intake manifold is sucking in let breathe the air to fuel ratio will be entirely out and cause the engine to stal