Hello, I have repaired greater than 30000 vehicles in my career and I need to question you questions previously I am not there in person to build up facts, data, or to exam your vehicle. I may question you to operate psychiatry in my stead. If study is needed and you would rather not be active testing, I can have enough money 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 sick pump will every repercussion in insufficient fuel living thing delivered to the engine. Might after that be worth cleaning out the idle keenness govern motor / valve as these acquire clogged occurring later than carbon and some brake cleaner washed through helps pardon things off.
afterward I begin the car, the engine surges happening amid 1200 and 2000 rpm encourage and forth. I misrepresented the IAC and the TPS similar to no fine-tune in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adapt the idle rapidity screw to lower the rpm and it would keep for a while. Now, the engine is forever surging to the reduction where I cannot steer it for dread of damage to the steer train. Any experienced solution?