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This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and thus not compensated for and can lean the engine out and can furthermore permit the engine to rev stirring gone not desired causing uncompromising running. As its a mechanical deviation it tends not to turn upon the deformity blithe and you can sometimes hear a hissing noise in the same way as the engine running.

Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a little more nearly the problem history. It currently has a master tech qualified idle expose direct valve and tps installed. without moving anything, the last (used) ecu and my original, would rule in the car without this symptom.

I don't have any check engine lights unless I unplug the MAF sensor. once the MAF is plugged in subsequently the car will stall unless I put my foot upon the accelerator. There is in addition to an intermittent popping strong coming at idle.