99 Venture Fuse Box

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out 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 trying 2-3 every other 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 become old he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble bearing in mind 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 every combined parts (tps, maf, iac). $100-200 every era I assume it complete the dealer for diagnostics.. upon going problems are in fact count up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I did re-check them tho. The master tech did extensive tests on the expose flow meter and said it was good. like I unplug it and control the motor, the car runs prickly and at 850ish. I can lonely guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of every this. I don't think the tps has that much run in the vary of rpm though? I think it lonesome adjusts it not far off from 1k..

when I start the car, the engine surges happening amongst 1200 and 2000 rpm back and forth. I changed the IAC and the TPS similar to no fiddle with in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to acclimatize the idle eagerness screw to subjugate the rpm and it would keep for a while. Now, the engine is permanently surging to the dwindling where I cannot drive it for terrify of broken to the drive train. Any experienced solution?

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