This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and correspondingly not compensated for and can lean the engine out and can also permit the engine to rev in the works past not desired causing prickly running. As its a mechanical oddity it tends not to slant on the fault blithe and you can sometimes listen a hissing noise past the engine running.
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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 tell you a little more nearly the misfortune history. It currently has a master tech certified idle let breathe rule valve and tps installed. without upsetting anything, the last (used) ecu and my original, would govern in the car without this symptom.
bearing in mind I start the car, the engine surges going on between 1200 and 2000 rpm put up to and forth. I distorted the IAC and the TPS similar to no amend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to familiarize the idle keenness screw to demean the rpm and it would withhold for a while. Now, the engine is at all times surging to the point where I cannot drive it for apprehension of broken to the steer train. Any experienced solution?
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