Hello, I have repaired greater than 30000 vehicles in my career and I need to question you questions back I am not there in person to store up facts, data, or to exam your vehicle. I may ask you to enactment investigation in my stead. If scrutiny is needed and you would rather not play a role testing, I can give my best advice, Fuel pressure?
Its afterward 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 upshot in insufficient fuel swine delivered to the engine. Might with be worth cleaning out the idle eagerness run motor / valve as these get clogged up in the manner of carbon and some brake cleaner washed through helps clear things off.
past I start the car, the engine surges going on amongst 1200 and 2000 rpm incite and forth. I changed the IAC and the TPS taking into consideration no regulate in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adapt the idle readiness screw to humiliate the rpm and it would sustain for a while. Now, the engine is for eternity surging to the point where I cannot steer it for alarm bell of damage to the steer train. Any experienced solution?