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Its with 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 result in insufficient fuel instinctive delivered to the engine. Might plus be worth cleaning out the idle zeal control motor / valve as these acquire clogged up next carbon and some brake cleaner washed through helps clear things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up 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 going on and is warmed up? oftentimes in engine put on an act many factors may cause the same symptom(s)