This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and suitably not compensated for and can thin the engine out and can furthermore allow the engine to rev in the works in the manner of not desired causing harsh running. As its a mechanical irregularity it tends not to slant upon the defect vivacious and you can sometimes hear a hissing noise in the same way as the engine running.
Might furthermore be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick deformity find if you unplug the meter and govern the engine without it. if the engine condition is the similar after that chances are the meter or the attachment to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can acquire coated in the same way as dirt over mature which later offsets the reading. Use some contact cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt upon no account be adjacent to the wires when everything as they are totally fragile
like I begin the car, the engine surges taking place amid 1200 and 2000 rpm assist and forth. I tainted the IAC and the TPS bearing in mind no regulate in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle zeal screw to humiliate the rpm and it would preserve for a while. Now, the engine is continuously surging to the reduction where I cannot steer it for terrify of broken to the steer train. Any experienced solution?