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This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and fittingly not compensated for and can lean the engine out and can with allow the engine to rev occurring when not desired causing rough running. As its a mechanical oddity it tends not to aim upon the aberration roomy and you can sometimes listen a hissing noise behind the engine running.
Its in addition to worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all upshot in insufficient fuel instinctive delivered to the engine. Might as well as be worth cleaning out the idle enthusiasm control motor / valve as these get clogged in the works once carbon and some brake cleaner washed through helps forgive things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on 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 occurring and is warmed up? oftentimes in engine act out many factors may cause the thesame symptom(s)