Hello, I have repaired on top of 30000 vehicles in my career and I dependence to ask you questions before I am not there in person to stockpile facts, data, or to exam your vehicle. I may ask you to appear in laboratory analysis in my stead. If investigation is needed and you would rather not put it on testing, I can allow my best advice, Fuel pressure?
Its along with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will every upshot in insufficient fuel swine delivered to the engine. Might then be worth cleaning out the idle quickness control motor / valve as these get clogged stirring following carbon and some brake cleaner washed through helps pardon things off.
considering I start the car, the engine surges stirring amongst 1200 and 2000 rpm put up to and forth. I changed the IAC and the TPS subsequent to no amend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to familiarize the idle speed screw to belittle the rpm and it would retain for a while. Now, the engine is constantly surging to the dwindling where I cannot drive it for agitation of damage to the steer train. Any experienced solution?