This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can as a consequence permit the engine to rev up in the same way as not desired causing gruff running. As its a mechanical oddity it tends not to slant upon the anomaly open and you can sometimes listen a hissing noise considering the engine running.
I did re-check them tho. The master tech did extensive tests upon the expose flow meter and said it was good. taking into consideration I unplug it and manage the motor, the car runs brusque and at 850ish. I can unaided guess that my extra 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 direct in the alternating of rpm though? I think it single-handedly adjusts it regarding 1k..
when I start the car, the engine surges taking place between 1200 and 2000 rpm help and forth. I distorted the IAC and the TPS similar to no fiddle with in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to familiarize the idle speed screw to degrade the rpm and it would sustain for a while. Now, the engine is continuously surging to the dwindling where I cannot drive it for warning of broken to the steer train. Any experienced solution?