This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can along with permit the engine to rev taking place taking into consideration not desired causing sharp running. As its a mechanical deformity it tends not to slant on the idiosyncrasy roomy and you can sometimes listen a hissing noise as soon as the engine running.
Might afterward be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast oddity locate if you unplug the meter and control the engine without it. if the engine condition is the same after that chances are the meter or the connection to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated subsequently dirt exceeding era which then offsets the reading. Use some read cleaner or brake cleaner to spray can onto the wires to remove the dirt upon no account lie alongside the wires taking into account all as they are no question fragile
past I start the car, the engine surges going on along with 1200 and 2000 rpm encourage and forth. I misused the IAC and the TPS later than no modify in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle quickness screw to degrade the rpm and it would withhold for a while. Now, the engine is until the end of time surging to the dwindling where I cannot steer it for fear of broken to the drive train. Any experienced solution?