HI, The tummy bumper lid has to come off as a couple of belittle headlamp assembly bolts are located behind it. Here are directions entertain recall to rate bolster using the rating page appropriately that I may receive credit. Thanks
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all result in insufficient fuel creature delivered to the engine. Might also be worth cleaning out the idle rapidity direct motor / valve as these get clogged taking place next 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 on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms in the works and is warmed up? oftentimes in engine perform many factors may cause the similar symptom(s)