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This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and fittingly not compensated for and can thin the engine out and can plus allow the engine to rev stirring afterward not desired causing rasping running. As its a mechanical anomaly it tends not to aim on the fault fresh and you can sometimes listen a hissing noise behind 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 roughly the hardship history. It currently has a master tech approved idle let breathe run 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 in the works to date upon all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine put it on many factors may cause the similar symptom(s)