Check the hose clips for tightness and examine the trunking for any cracks or splits and after that all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretension to locate a leak is to have the engine government and hot and next spray lighter gas /propane or brake cleaner approximately 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 little more not quite the trouble history. It currently has a master tech endorsed idle air govern valve and tps installed. without upsetting anything, the last (used) ecu and my original, would run in the car without this symptom.
I don't have any check engine lights unless I unplug the MAF sensor. subsequently the MAF is plugged in then the car will stall unless I put my foot upon the accelerator. There is moreover an intermittent popping hermetically sealed coming at idle.