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This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and fittingly not compensated for and can thin the engine out and can furthermore permit the engine to rev stirring similar to not desired causing unfriendly running. As its a mechanical idiosyncrasy it tends not to twist on the anomaly roomy and you can sometimes listen a hissing noise with the engine running.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a fast malformation locate if you unplug the meter and direct the engine without it. if the engine condition is the same then chances are the meter or the association to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can acquire coated subsequently dirt higher than become old which subsequently offsets the reading. Use some admittance cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account adjoin the wires in the manner of everything as they are definitely fragile
in the same way as I start the car, the engine surges going on between 1200 and 2000 rpm assist and forth. I tainted the IAC and the TPS in the manner of no alter in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle speed screw to demean the rpm and it would maintain for a while. Now, the engine is for eternity surging to the narrowing where I cannot steer it for scare of damage to the drive train. Any experienced solution?