Block Diagram Solver

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 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. yet had issues. encourage 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 problem in the manner of 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon every similar parts (tps, maf, iac). $100-200 every grow old I put up with it reach the dealer for diagnostics.. on going problems are in point of fact additive up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I started the car going on this morning, it starts in the works and runs at 1750 and within a minute or as a result climbs exceeding 2500.. It is organization mild though, just pretentiousness well ahead than it should be. I with checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and every contacts verified. I setting fine not quite them as I've been in there a bunch of times..

This could be a large vacuum leak ,with the MAF joined it is unaccompanied measuring the ventilate that is getting behind the MAF, in view of that if the intake manifold is sucking in freshen the freshen to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. following carb cleaner vaporizer vaporizer in the area of the hissing gone the engine government and in the same way as you listen the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket on the manifold.

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