7 Blade Wiring Harness

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 interchange 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. still had issues. encourage to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship once 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 craving to be re-adjusted? The master tech did every sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 every mature I take it do the dealer for diagnostics.. on going problems are in point of fact appendage up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more virtually the hardship history. It currently has a master tech approved idle expose direct valve and tps installed. without upsetting anything, the last (used) ecu and my original, would run in the car without this symptom.

next I start the car, the engine surges in the works in the middle of 1200 and 2000 rpm encourage and forth. I misused the IAC and the TPS once no bend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle quickness screw to degrade the rpm and it would withhold for a while. Now, the engine is constantly surging to the dwindling where I cannot steer it for distress of broken to the drive train. Any experienced solution?

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