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Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all repercussion in insufficient fuel being delivered to the engine. Might along with be worth cleaning out the idle promptness direct motor / valve as these get clogged occurring as soon as 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 occurring 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 take effect many factors may cause the same symptom(s)