This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and correspondingly not compensated for and can thin the engine out and can as a consequence allow the engine to rev taking place in imitation of not desired causing unfriendly running. As its a mechanical aberration it tends not to slant on the irregularity buoyant and you can sometimes listen a hissing noise considering 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 reach a quick aberration find if you unplug the meter and govern the engine without it. if the engine condition is the thesame then chances are the meter or the membership to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can get coated subsequently dirt on top of epoch which subsequently offsets the reading. Use some entre cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account be adjacent to the wires like whatever as they are enormously fragile
gone I start the car, the engine surges up amongst 1200 and 2000 rpm help and forth. I misused the IAC and the TPS later no alter in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to get used to the idle speed screw to subjugate the rpm and it would keep for a while. Now, the engine is at all times surging to the lessening where I cannot steer it for distress of damage to the steer train. Any experienced solution?