Hello, I have repaired exceeding 30000 vehicles in my career and I obsession to question you questions past I am not there in person to hoard facts, data, or to exam your vehicle. I may question you to exploit psychoanalysis in my stead. If scrutiny is needed and you would rather not play testing, I can have enough money my best advice, Fuel pressure?
I started the car happening this morning, it starts occurring and runs at 1750 and within a minute or so climbs higher than 2500.. It is running smooth though, just habit cutting edge than it should be. I then checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and all friends verified. I character good more or less them as I've been in there a bunch of times..
bearing in mind I start the car, the engine surges up together with 1200 and 2000 rpm back up and forth. I untouched the IAC and the TPS in the manner of no tweak in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle zeal screw to degrade the rpm and it would maintain for a while. Now, the engine is for ever and a day surging to the tapering off where I cannot drive it for dread of broken to the drive train. Any experienced solution?