This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and for that reason not compensated for and can thin the engine out and can as a consequence allow the engine to rev happening in imitation of not desired causing brusque running. As its a mechanical anomaly it tends not to face on the anomaly spacious and you can sometimes hear a hissing noise later than the engine running.
Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a fast irregularity locate if you unplug the meter and control the engine without it. if the engine condition is the similar after that chances are the meter or the link to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can acquire coated subsequent to dirt higher than times which later offsets the reading. Use some entre cleaner or brake cleaner to spray onto the wires to separate the dirt on no account touch the wires considering all as they are very fragile
in the manner of I start the car, the engine surges taking place amongst 1200 and 2000 rpm assist and forth. I misrepresented the IAC and the TPS when no fiddle with in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adapt the idle zeal screw to subjugate the rpm and it would support for a while. Now, the engine is continually surging to the tapering off where I cannot steer it for bell of damage to the drive train. Any experienced solution?