Check the hose clips for tightness and inspect the trunking for any cracks or splits and furthermore all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine doling out and warm and then spray lighter gas /propane or brake cleaner approximately each joint in turn. If the engine rev s happening 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 more or less the difficulty history. It currently has a master tech ascribed idle let breathe run valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would manage in the car without this symptom.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you occurring to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms happening and is warmed up? oftentimes in engine performance many factors may cause the similar symptom(s)