Chrysler Electrical Schematic

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 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. nevertheless had issues. support to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering with this car.. bought a used one.. more trouble. had the native 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 all sorts of diagnostics on every connected parts (tps, maf, iac). $100-200 all get older I acknowledge it reach the dealer for diagnostics.. on going problems are essentially appendage up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Its as a consequence worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will every repercussion in insufficient fuel living thing delivered to the engine. Might after that be worth cleaning out the idle promptness control motor / valve as these acquire clogged happening with carbon and some brake cleaner washed through helps forgive things off.

later I start the car, the engine surges going on together with 1200 and 2000 rpm assist and forth. I tainted the IAC and the TPS as soon as no modify in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to get used to the idle promptness screw to humiliate the rpm and it would hold for a while. Now, the engine is until the end of time surging to the lessening where I cannot steer it for bell of damage to the drive train. Any experienced solution?

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