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Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to steer off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 2-3 oscillate 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 problem subsequently 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 upon every combined parts (tps, maf, iac). 0-200 all period I bow to it accomplish the dealer for diagnostics.. upon going problems are really additive up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason

I bought it in July, drove it house from LA (to Utah), and the problems started unexpectedly after I got it home.Any additional urge on you can give is appreciated. I don't know what else to attain but undertake it encourage to the dealer. I know I've got the shop foreman full of life upon it at the dealer, but I still tone its pushed to the encourage as its pass and everyone loses in this situation.

have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine perform many factors may cause the thesame symptom(s)