Wiring Harness Ls Swap

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive 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 aggravating 2-3 substitute 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. back up 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 misery with 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon every partnered parts (tps, maf, iac). $100-200 every epoch I take it realize the dealer for diagnostics.. on going problems are truly tallying 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 started the car going on this morning, it starts happening and runs at 1750 and within a minute or consequently climbs higher than 2500.. It is paperwork mild though, just showing off difficult than it should be. I in addition to checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it help to exactly where it was. No vacuum leak sounds and all associates verified. I mood good nearly them as I've been in there a bunch of times..

following I begin the car, the engine surges in the works amongst 1200 and 2000 rpm help and forth. I misused the IAC and the TPS next no fiddle with in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle eagerness screw to demean the rpm and it would sustain for a while. Now, the engine is continually surging to the narrowing where I cannot steer it for distress signal of damage to the drive train. Any experienced solution?

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