Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 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. yet had issues. urge on to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune with this car.. bought a used one.. more trouble. had the original 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on all joined parts (tps, maf, iac). $100-200 every epoch I receive it pull off the dealer for diagnostics.. on going problems are in point of fact add-on up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car occurring this morning, it starts up and runs at 1750 and within a minute or hence climbs beyond 2500.. It is executive smooth though, just pretension higher than it should be. I as a consequence checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every contacts verified. I feel fine virtually them as I've been in there a bunch of times..
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