This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and hence not compensated for and can lean the engine out and can moreover permit the engine to rev occurring similar to not desired causing rasping running. As its a mechanical aberration it tends not to point upon the fault vivacious and you can sometimes listen a hissing noise afterward the engine running.
I bought it in July, drove it house from LA (to Utah), and the problems started rudely after I got it home.Any supplementary help you can allow is appreciated. I don't know what else to do but resign yourself to it help to the dealer. I know I've got the shop foreman involved upon it at the dealer, but I still feel its pushed to the support as its old-fashioned and everyone loses in this situation.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening to date upon 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 work many factors may cause the similar symptom(s)