This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and fittingly not compensated for and can thin the engine out and can plus permit the engine to rev in the works similar to not desired causing sharp running. As its a mechanical aberration it tends not to incline upon the aberration blithe and you can sometimes listen a hissing noise following the engine running.
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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 not quite the misery history. It currently has a master tech official idle let breathe run valve and tps installed. without disturbing anything, the last (used) ecu and my original, would rule in the car without this symptom.
similar to I begin the car, the engine surges going on along with 1200 and 2000 rpm back up and forth. I tainted the IAC and the TPS once no modify in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to get used to the idle quickness screw to subjugate the rpm and it would support for a while. Now, the engine is at all times surging to the dwindling where I cannot steer it for unease of broken to the drive train. Any experienced solution?
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