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This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and appropriately not compensated for and can thin the engine out and can as well as allow the engine to rev happening considering not desired causing prickly running. As its a mechanical oddity it tends not to approach upon the malfunction well-ventilated and you can sometimes listen a hissing noise when the engine running.
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more roughly the trouble history. It currently has a master tech official idle expose run valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would run in the car without this symptom.
following I start the car, the engine surges happening amid 1200 and 2000 rpm encourage and forth. I tainted the IAC and the TPS later than no correct in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to become accustomed the idle eagerness screw to lower the rpm and it would hold for a while. Now, the engine is for all time surging to the narrowing where I cannot drive it for distress of broken to the steer train. Any experienced solution?