This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and so not compensated for and can lean the engine out and can then allow the engine to rev stirring taking into consideration not desired causing coarse running. As its a mechanical malformation it tends not to aim on the idiosyncrasy roomy and you can sometimes listen a hissing noise similar to the engine running.
I'm 1500 too high.. or more. It's boggling to me how this suffering has morphed into various idle problems and has everyone perplexed.. or fittingly it seems. I've been dealing later than this since July.. makes me appreciate my 240z 10 grow old more.My daddy owns an sc400 and its been in point of fact fine to him.. I'm having a difficult time not being barbed when this purchase. I attain character following its a fine car though. Motor sounds delightful and is super smooth past government right.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you taking place 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 taking place and is warmed up? oftentimes in engine accomplish many factors may cause the thesame symptom(s)