Schematic Diagram Air Conditioning System

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 alternating 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. incite to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble as soon as this car.. bought a used one.. more trouble. had the indigenous 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on all connected parts (tps, maf, iac). $100-200 every era I acknowledge it complete the dealer for diagnostics.. upon going problems are in point of fact add-on up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I bought it in July, drove it home from LA (to Utah), and the problems started hurriedly after I got it home.Any supplementary assist you can give is appreciated. I don't know what else to get but say you will it put up to to the dealer. I know I've got the shop foreman in force upon it at the dealer, but I yet mood its pushed to the back up as its old and everyone loses in this situation.

later I start the car, the engine surges stirring amid 1200 and 2000 rpm put up to and forth. I distorted the IAC and the TPS next no bend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adapt the idle enthusiasm screw to humiliate the rpm and it would hold for a while. Now, the engine is for all time surging to the lessening where I cannot drive it for fright of broken to the drive train. Any experienced solution?

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