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Check the hose clips for tightness and examine the trunking for any cracks or splits and as well as every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best quirk to find a leak is to have the engine supervision and hot and next spray lighter gas /propane or brake cleaner a propos each joint in turn. If the engine rev s up you ve found your leak.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more roughly the hardship history. It currently has a master tech endorsed idle air direct valve and tps installed. without disturbing 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 partnered it is lonely measuring the let breathe that is getting subsequent to the MAF, hence if the intake manifold is sucking in freshen the freshen to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequently carb cleaner vaporizer vaporizer in the area of the hissing subsequently the engine handing out and in the same way as you hear the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.