Hello, I have repaired more than 30000 vehicles in my career and I dependence to ask you questions past I am not there in person to accrue facts, data, or to test your vehicle. I may ask you to behave breakdown in my stead. If examination is needed and you would rather not pretense testing, I can offer 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 in poor health pump will all outcome in insufficient fuel subconscious delivered to the engine. Might in addition to be worth cleaning out the idle swiftness manage motor / valve as these get clogged happening gone carbon and some brake cleaner washed through helps free things off.
when I start the car, the engine surges going on amid 1200 and 2000 rpm back and forth. I untouched the IAC and the TPS past no change in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to acclimatize the idle readiness screw to humiliate the rpm and it would withhold for a while. Now, the engine is every time surging to the lessening where I cannot drive it for fright of damage to the drive train. Any experienced solution?