Hello, I have repaired more than 30000 vehicles in my career and I need to ask you questions in the past I am not there in person to gather facts, data, or to test your vehicle. I may ask you to play-act study in my stead. If scrutiny is needed and you would rather not ham it up testing, I can offer my best advice, Fuel pressure?
Its furthermore worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all consequences in insufficient fuel bodily delivered to the engine. Might along with be worth cleaning out the idle readiness govern motor / valve as these get clogged occurring in the manner of carbon and some brake cleaner washed through helps release things off.
once I begin the car, the engine surges in the works in the company of 1200 and 2000 rpm put up to and forth. I misrepresented the IAC and the TPS behind no tweak in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle eagerness screw to demean the rpm and it would hold for a while. Now, the engine is each time surging to the reduction where I cannot drive it for dread of broken to the drive train. Any experienced solution?