This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can in addition to allow the engine to rev taking place gone not desired causing scratchy running. As its a mechanical irregularity it tends not to approach on the aberration light and you can sometimes listen a hissing noise behind the engine running.
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all outcome in insufficient fuel instinctive delivered to the engine. Might along with be worth cleaning out the idle swiftness control motor / valve as these acquire clogged occurring following carbon and some brake cleaner washed through helps free things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms happening and is warmed up? oftentimes in engine behave many factors may cause the similar symptom(s)
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