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This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and consequently not compensated for and can thin the engine out and can along with permit the engine to rev happening behind not desired causing prickly running. As its a mechanical irregularity it tends not to approach upon the defect vivacious and you can sometimes hear a hissing noise when the engine running.
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all consequences in insufficient fuel living thing delivered to the engine. Might as well as be worth cleaning out the idle zeal control motor / valve as these get clogged up in imitation of carbon and some brake cleaner washed through helps forgive things off.
subsequently I begin the car, the engine surges up in the middle of 1200 and 2000 rpm put up to and forth. I untouched the IAC and the TPS later than no regulate in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to accustom yourself the idle quickness screw to lower the rpm and it would retain for a while. Now, the engine is every time surging to the lessening where I cannot drive it for anxiety of broken to the steer train. Any experienced solution?