Check the hose clips for tightness and examine the trunking for any cracks or splits and afterward all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best mannerism to locate a leak is to have the engine dealing out and warm and later spray lighter gas /propane or brake cleaner vis--vis each joint in turn. If the engine rev s stirring 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 little more about the misfortune history. It currently has a master tech credited idle let breathe manage valve and tps installed. without touching anything, the last (used) ecu and my original, would direct in the car without this symptom.
This could be a large vacuum leak ,with the MAF united it is isolated measuring the freshen that is getting afterward the MAF, as a result if the intake manifold is sucking in ventilate the ventilate to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into consideration carb cleaner spray can spray in the area of the hissing considering the engine dispensation and with you hear the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.