Chevy Fuse Box Diagrams

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 vary used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. still had issues. help to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty as soon as this car.. bought a used one.. more trouble. had the native one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS habit to be re-adjusted? The master tech did every sorts of diagnostics upon all united parts (tps, maf, iac). $100-200 all grow old I take it complete the dealer for diagnostics.. on going problems are essentially totaling up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I did re-check them tho. The master tech did extensive tests on the freshen flow meter and said it was good. once I unplug it and manage the motor, the car runs severe and at 850ish. I can single-handedly guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of all this. I don't think the tps has that much rule in the rotate of rpm though? I think it deserted adjusts it approaching 1k..

subsequently I start the car, the engine surges in the works in the middle of 1200 and 2000 rpm back and forth. I distorted the IAC and the TPS behind no correct in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to familiarize the idle speed screw to subjugate the rpm and it would hold for a while. Now, the engine is every time surging to the tapering off where I cannot drive it for unease of broken to the steer train. Any experienced solution?

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