This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and as a result not compensated for and can thin the engine out and can then permit the engine to rev occurring as soon as not desired causing uncompromising running. As its a mechanical malfunction it tends not to twist on the irregularity fresh and you can sometimes listen a hissing noise like 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 very nearly the burden history. It currently has a master tech qualified idle air direct valve and tps installed. without upsetting anything, the last (used) ecu and my original, would rule in the car without this symptom.
behind I start the car, the engine surges taking place amongst 1200 and 2000 rpm support and forth. I tainted the IAC and the TPS once no fine-tune in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to familiarize the idle rapidity screw to belittle the rpm and it would support for a while. Now, the engine is for ever and a day surging to the dwindling where I cannot drive it for alarm bell of damage to the steer train. Any experienced solution?
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