This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and as a result not compensated for and can lean the engine out and can next permit the engine to rev taking place subsequently not desired causing coarse running. As its a mechanical aberration it tends not to position upon the defect spacious and you can sometimes hear a hissing noise later than the engine running.
I bought it in July, drove it home from LA (to Utah), and the problems started brusquely after I got it home.Any extra support you can manage to pay for is appreciated. I don't know what else to get but consent it assist to the dealer. I know I've got the shop foreman enthusiastic on it at the dealer, but I yet tone its pushed to the help as its obsolescent and everyone loses in this situation.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you in the works 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 going on and is warmed up? oftentimes in engine do its stuff many factors may cause the similar symptom(s)