This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can then permit the engine to rev taking place once not desired causing scratchy running. As its a mechanical irregularity it tends not to slant upon the idiosyncrasy lively and you can sometimes listen a hissing noise bearing in mind the engine running.
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I did re-check them tho. The master tech did extensive tests upon the freshen flow meter and said it was good. in the same way as I unplug it and direct the motor, the car runs uncompromising and at 850ish. I can unaccompanied guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of every this. I don't think the tps has that much run in the rotate of rpm though? I think it single-handedly adjusts it just about 1k..
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine operate many factors may cause the thesame symptom(s)
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