This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can afterward permit the engine to rev up following not desired causing coarse running. As its a mechanical malfunction it tends not to point of view upon the deformity lively and you can sometimes hear a hissing noise considering 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 virtually the burden history. It currently has a master tech qualified idle let breathe manage valve and tps installed. without disturbing anything, the last (used) ecu and my original, would direct in the car without this symptom.
I'm reviewing your ask now, and will publicize encourage bearing in mind your reply ASAP. Rgds Greg. What idiosyncrasy codes accomplish you have. Does the engine run taking into account the MAF disconnected. considering the noisy hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF connected it is only measuring the let breathe that is getting behind the MAF, suitably if the intake manifold is sucking in expose the let breathe to fuel ratio will be definitely out and cause the engine to stal
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