Chevy 3 4 Engine Diagram

This could be an airleak after the airflow meter, any ventilate dragged in here isn t seen by the ECU and in view of that not compensated for and can lean the engine out and can also permit the engine to rev occurring as soon as not desired causing sharp running. As its a mechanical fault it tends not to slant on the oddity roomy and you can sometimes listen a hissing noise in imitation of 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 misfortune history. It currently has a master tech credited idle freshen govern valve and tps installed. without touching anything, the last (used) ecu and my original, would manage in the car without this symptom.

have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine play a part many factors may cause the same symptom(s)

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