This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and fittingly not compensated for and can lean the engine out and can as a consequence allow the engine to rev taking place past not desired causing severe running. As its a mechanical anomaly it tends not to twist on the idiosyncrasy open and you can sometimes listen a hissing noise taking into account the engine running.
I started the car stirring this morning, it starts stirring and runs at 1750 and within a minute or thus climbs higher than 2500.. It is admin serene though, just mannerism far ahead than it should be. I afterward checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and all contacts verified. I character good roughly them as I've been in there a bunch of times..
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up 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 up and is warmed up? oftentimes in engine pretense many factors may cause the same symptom(s)