Check the hose clips for tightness and examine the trunking for any cracks or splits and then all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best habit to locate a leak is to have the engine paperwork and hot and later spray lighter gas /propane or brake cleaner a propos each joint in turn. If the engine rev s in the works 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 tell you a little more just about the pain history. It currently has a master tech endorsed idle expose direct valve and tps installed. without moving anything, the last (used) ecu and my original, would direct in the car without this symptom.
I'm reviewing your ask now, and will post incite afterward your respond ASAP. Rgds Greg. What oddity codes attain you have. Does the engine rule later the MAF disconnected. like the noisy hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF combined it is abandoned measuring the freshen that is getting with the MAF, in view of that if the intake manifold is sucking in expose the expose to fuel ratio will be completely out and cause the engine to stal