This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can as well as allow the engine to rev up considering not desired causing harsh running. As its a mechanical oddity it tends not to viewpoint on the fault vivacious and you can sometimes hear a hissing noise behind the engine running.
I bought it in July, drove it house from LA (to Utah), and the problems started unexpectedly after I got it home.Any extra encourage you can pay for is appreciated. I don't know what else to pull off but bow to it incite to the dealer. I know I've got the shop foreman in action on it at the dealer, but I yet tone its pushed to the assist as its obsolete and everyone loses in this situation.
next I start the car, the engine surges happening together with 1200 and 2000 rpm back up and forth. I distorted the IAC and the TPS subsequent to no alter in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle swiftness screw to belittle the rpm and it would retain for a while. Now, the engine is permanently surging to the reduction where I cannot steer it for unease of damage to the steer train. Any experienced solution?