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The stabilitrak fault is caused by the misfire condition. One of the ways the car regains control is by reducing engine power during a stabilitrak even. Once the ECM recognizes a misfire the engine can no longer be relied upon, but is still part of the whole stabiltrak system. This is why the stabilitrak warning comes up. Intermittent issue with the misfire is the diagnostic direction the tech should be taking. Loose plug wires, partially disconnected coil-pack connectors, anything like that. Could also be a bad plug.
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