This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and for that reason not compensated for and can thin the engine out and can plus allow the engine to rev in the works later not desired causing sharp running. As its a mechanical malformation it tends not to viewpoint upon the defect light and you can sometimes listen a hissing noise subsequent to the engine running.
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 approximately the trouble history. It currently has a master tech credited idle expose direct valve and tps installed. without touching anything, the last (used) ecu and my original, would govern in the car without this symptom.
I don't have any check engine lights unless I unplug the MAF sensor. behind the MAF is plugged in after that the car will stall unless I put my foot on the accelerator. There is as a consequence an intermittent popping unassailable coming at idle.