This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and hence not compensated for and can thin the engine out and can in addition to permit the engine to rev occurring past not desired causing rough running. As its a mechanical irregularity it tends not to slope upon the deformity roomy and you can sometimes listen a hissing noise similar to the engine running.
I bought it in July, drove it house from LA (to Utah), and the problems started shortly after I got it home.Any additional back you can meet the expense of is appreciated. I don't know what else to complete but take on it help to the dealer. I know I've got the shop foreman practicing upon it at the dealer, but I nevertheless quality its pushed to the incite as its pass and everyone loses in this situation.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine affect many factors may cause the similar symptom(s)