Now you might think that spraying lighter gas not far off from a warm engine isnt wise, however the flash /ignition lessening of gas is virtually 400C thus you obsession a naked ember or spark to set it off and Ive used this method for many years without incident. acquit yourself your showing off through each possible joint one at a time and you should locate it. I use a slightly flattened fragment of brake pipe and some rubber hose from the can of lighter gas to find the money for a spraying wand and allow a forward blast of gas into each area, especially those hard to reach similar to large implements.
Its as well as worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all outcome in insufficient fuel living thing delivered to the engine. Might afterward be worth cleaning out the idle quickness run motor / valve as these get clogged going on following carbon and some brake cleaner washed through helps clear things off.
I'm reviewing your question now, and will publish encourage behind your answer ASAP. Rgds Greg. What defect codes do you have. Does the engine control next the MAF disconnected. later than the noisy hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is unaided measuring the freshen that is getting subsequently the MAF, thus if the intake manifold is sucking in air the freshen to fuel ratio will be enormously out and cause the engine to stal