Hello, I have repaired greater than 30000 vehicles in my career and I dependence to ask you questions before I am not there in person to store up facts, data, or to exam your vehicle. I may ask you to take effect scrutiny in my stead. If examination is needed and you would rather not do something testing, I can offer my best advice, Fuel pressure?
Its afterward 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 brute delivered to the engine. Might moreover be worth cleaning out the idle enthusiasm control motor / valve as these get clogged up gone carbon and some brake cleaner washed through helps pardon things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening 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 fake many factors may cause the similar symptom(s)