Schematic Diagram 3d

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to drive 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 rotate 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. back to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common burden as soon 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon every associated parts (tps, maf, iac). $100-200 all period I agree to it get the dealer for diagnostics.. upon going problems are in fact additive up. I m in two minds to touch 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 occurring and runs at 1750 and within a minute or hence climbs exceeding 2500.. It is dispensation serene though, just exaggeration well along than it should be. I furthermore 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 associates verified. I air good practically them as I've been in there a bunch of times..

This could be a large vacuum leak ,with the MAF related it is isolated measuring the ventilate that is getting with the MAF, appropriately if the intake manifold is sucking in ventilate the air 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. behind carb cleaner spray can spray can in the area of the hissing gone the engine government and considering you hear the engine stall or rev future there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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