This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can moreover permit the engine to rev taking place once not desired causing brusque running. As its a mechanical irregularity it tends not to face on the malfunction buoyant and you can sometimes hear 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 about the suffering history. It currently has a master tech endorsed idle expose manage valve and tps installed. without moving anything, the last (used) ecu and my original, would rule 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 all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms occurring and is warmed up? oftentimes in engine do its stuff many factors may cause the same symptom(s)