This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and so not compensated for and can thin the engine out and can plus permit the engine to rev happening following not desired causing sharp running. As its a mechanical oddity it tends not to point of view on the oddity roomy and you can sometimes hear a hissing noise following 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 tiny more practically the problem history. It currently has a master tech approved idle air manage valve and tps installed. without disturbing anything, the last (used) ecu and my original, would run in the car without this symptom.
I don’t have any check engine lights unless I unplug the MAF sensor. following the MAF is plugged in then the car will stall unless I put my foot upon the accelerator. There is after that an intermittent popping solid coming at idle.
Picture Schematics for 99 mercury cougar fuel pump wiring diagram
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