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 thin the engine out and can afterward permit the engine to rev in the works taking into account not desired causing sharp running. As its a mechanical defect it tends not to aim on the anomaly blithe and you can sometimes hear a hissing noise later than the engine running.
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a fast deviation locate if you unplug the meter and direct the engine without it. if the engine condition is the thesame later chances are the meter or the membership to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can acquire coated afterward dirt more than epoch which next offsets the reading. Use some gate cleaner or brake cleaner to spray onto the wires to cut off the dirt on no account lie alongside the wires past whatever as they are entirely fragile
taking into consideration I start the car, the engine surges occurring along with 1200 and 2000 rpm back and forth. I distorted the IAC and the TPS taking into account no correct in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle rapidity screw to degrade the rpm and it would sustain for a while. Now, the engine is constantly surging to the point where I cannot steer it for fright of damage to the drive train. Any experienced solution?