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This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and so not compensated for and can lean the engine out and can moreover allow the engine to rev happening taking into account not desired causing coarse running. As its a mechanical idiosyncrasy it tends not to slant upon the defect fresh and you can sometimes listen a hissing noise with the engine running.
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all consequences in insufficient fuel living thing delivered to the engine. Might after that be worth cleaning out the idle swiftness run motor / valve as these get clogged happening as soon as carbon and some brake cleaner washed through helps free things off.
like I start the car, the engine surges in the works in the company of 1200 and 2000 rpm help and forth. I misused the IAC and the TPS when no fiddle with in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to get used to the idle readiness screw to belittle the rpm and it would keep for a while. Now, the engine is for eternity surging to the reduction where I cannot drive it for scare of damage to the steer train. Any experienced solution?