This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can in addition to allow the engine to rev going on when not desired causing brusque running. As its a mechanical idiosyncrasy it tends not to turn upon the irregularity light and you can sometimes hear a hissing noise behind the engine running.
I bought it in July, drove it home from LA (to Utah), and the problems started gruffly after I got it home.Any further put up to you can find the money for is appreciated. I don't know what else to get but assume it incite to the dealer. I know I've got the shop foreman vigorous upon it at the dealer, but I yet mood its pushed to the encourage as its old and everyone loses in this situation.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on 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 action many factors may cause the thesame symptom(s)