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 lean the engine out and can with permit the engine to rev stirring later than not desired causing aggressive running. As its a mechanical deformity it tends not to twist upon the anomaly spacious and you can sometimes listen a hissing noise considering the engine running.
I did re-check them tho. The master tech did extensive tests on the expose flow meter and said it was good. with I unplug it and control the motor, the car runs prickly and at 850ish. I can unaided guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of all this. I don't think the tps has that much direct in the different of rpm though? I think it solitary adjusts it with reference to 1k..
afterward I begin the car, the engine surges happening amid 1200 and 2000 rpm put up to and forth. I changed the IAC and the TPS gone no change in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to accustom yourself the idle rapidity screw to belittle the rpm and it would support for a while. Now, the engine is for eternity surging to the tapering off where I cannot steer it for apprehension of broken to the steer train. Any experienced solution?