Hello, I have repaired higher than 30000 vehicles in my career and I compulsion to question you questions past I am not there in person to pile up facts, data, or to exam your vehicle. I may ask you to doing breakdown in my stead. If laboratory analysis is needed and you would rather not feint testing, I can have the funds for my best advice, Fuel pressure?
Its in addition to 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 all repercussion in insufficient fuel brute delivered to the engine. Might afterward be worth cleaning out the idle rapidity manage motor / valve as these get clogged taking place once carbon and some brake cleaner washed through helps forgive things off.
past I begin the car, the engine surges occurring amongst 1200 and 2000 rpm help and forth. I misused the IAC and the TPS subsequently no regulate in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle eagerness screw to degrade the rpm and it would support for a while. Now, the engine is until the end of time surging to the dwindling where I cannot steer it for distress of broken to the steer train. Any experienced solution?