This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and thus not compensated for and can thin the engine out and can as well as allow the engine to rev taking place as soon as not desired causing scratchy running. As its a mechanical irregularity it tends not to face on the fault well-ventilated and you can sometimes hear a hissing noise similar to 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 little more roughly the misfortune history. It currently has a master tech credited idle ventilate run valve and tps installed. without heartwarming anything, the last (used) ecu and my original, would control in the car without this symptom.
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Photo Schematics for 92 lexus sc400 wiring diagram
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