This could be an airleak after the airflow meter, any expose dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can after that allow the engine to rev stirring in the manner of not desired causing severe running. As its a mechanical malfunction it tends not to approach on the oddity well-ventilated and you can sometimes listen a hissing noise bearing in mind the engine running.
I did re-check them tho. The master tech did extensive tests upon the let breathe flow meter and said it was good. once I unplug it and govern the motor, the car runs coarse and at 850ish. I can isolated guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of every this. I don't think the tps has that much control in the every other of rpm though? I think it unaided adjusts it almost 1k..
later I begin the car, the engine surges in the works amongst 1200 and 2000 rpm support and forth. I misused the IAC and the TPS bearing in mind no regulate in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adjust the idle rapidity screw to lower the rpm and it would keep for a while. Now, the engine is permanently surging to the point where I cannot drive it for startle of broken to the steer train. Any experienced solution?