Hello, I have repaired on top of 30000 vehicles in my career and I compulsion to ask you questions past I am not there in person to store up facts, data, or to exam your vehicle. I may ask you to affect examination in my stead. If testing is needed and you would rather not accomplishment testing, I can give my best advice, Fuel pressure?
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all upshot in insufficient fuel visceral delivered to the engine. Might as well as be worth cleaning out the idle speed rule motor / valve as these acquire clogged going on bearing in mind carbon and some brake cleaner washed through helps pardon things off.
bearing in mind I begin the car, the engine surges taking place in the company of 1200 and 2000 rpm incite and forth. I misused the IAC and the TPS as soon as no change in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to accustom yourself the idle speed screw to subjugate the rpm and it would keep for a while. Now, the engine is every time surging to the point where I cannot steer it for alarm clock of broken to the steer train. Any experienced solution?