Hello, I have repaired higher than 30000 vehicles in my career and I compulsion to question you questions back I am not there in person to assemble facts, data, or to exam your vehicle. I may question you to feint study in my stead. If assay is needed and you would rather not bill testing, I can meet the expense of my best advice, Fuel pressure?
Its then 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 consequences in insufficient fuel physical delivered to the engine. Might furthermore be worth cleaning out the idle speed run motor / valve as these acquire clogged up once carbon and some brake cleaner washed through helps forgive things off.
in the manner of I start the car, the engine surges occurring amid 1200 and 2000 rpm incite and forth. I distorted the IAC and the TPS past no amend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to get used to the idle swiftness screw to lower the rpm and it would hold for a while. Now, the engine is for all time surging to the tapering off where I cannot drive it for distress of damage to the steer train. Any experienced solution?