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Now you might think that spraying lighter gas in the region of a warm engine isnt wise, however the flash /ignition reduction of gas is about 400C for that reason you obsession a naked blaze or spark to set it off and Ive used this method for many years without incident. ham it up your showing off through each viable 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 offer a spraying wand and permit a direct blast of gas into each area, especially those hard to accomplish afterward large implements.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a little more virtually the difficulty history. It currently has a master tech qualified idle freshen govern valve and tps installed. without touching anything, the last (used) ecu and my original, would control in the car without this symptom.
This could be a large vacuum leak ,with the MAF joined it is solitary measuring the ventilate that is getting past the MAF, correspondingly if the intake manifold is sucking in ventilate the ventilate to fuel ratio will be utterly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. gone carb cleaner spray spray in the area of the hissing following the engine dealing out and taking into consideration you listen the engine stall or rev far ahead there is the leak ,could be a bad vacuum hose bad gasket on the manifold.