This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and in view of that not compensated for and can thin the engine out and can in addition to permit the engine to rev happening later not desired causing rough running. As its a mechanical defect it tends not to turn on the malfunction vivacious and you can sometimes listen a hissing noise subsequently 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 about the trouble history. It currently has a master tech certified idle let breathe manage valve and tps installed. without touching 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. afterward the MAF is plugged in later the car will stall unless I put my foot on the accelerator. There is in addition to an intermittent popping sound coming at idle.
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