This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and thus not compensated for and can thin the engine out and can plus permit the engine to rev going on subsequent to not desired causing scratchy running. As its a mechanical malfunction it tends not to point upon the deviation vivacious 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 tell you a little more about the burden history. It currently has a master tech certified idle air manage valve and tps installed. without touching anything, the last (used) ecu and my original, would control in the car without this symptom.
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