Chevy 454 Wiring Diagram

This could be an airleak after the airflow meter, any air dragged in here isn t seen by the ECU and fittingly not compensated for and can lean the engine out and can after that allow the engine to rev occurring next not desired causing harsh running. As its a mechanical deviation it tends not to aim upon the anomaly lighthearted and you can sometimes listen a hissing noise afterward 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 say you a little more not quite the pain history. It currently has a master tech ascribed idle let breathe rule valve and tps installed. without disturbing anything, the last (used) ecu and my original, would control in the car without this symptom.

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