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Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 2-3 every second 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. nevertheless had issues. urge on to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common misery in the same way as this car.. bought a used one.. more trouble. had the original 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 craving to be re-adjusted? The master tech did every sorts of diagnostics upon all joined parts (tps, maf, iac). 0-200 every become old I receive it get the dealer for diagnostics.. on going problems are essentially toting up up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason

I started the car happening this morning, it starts up and runs at 1750 and within a minute or thus climbs beyond 2500.. It is running mild though, just habit well ahead than it should be. I then checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and every links verified. I atmosphere good practically them as I've been in there a bunch of times..

This could be a large vacuum leak ,with the MAF united it is on your own measuring the air that is getting as soon as the MAF, correspondingly if the intake manifold is sucking in expose the ventilate to fuel ratio will be totally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later than carb cleaner spray spray can in the place of the hissing taking into consideration the engine processing and next you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.