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Was it a bang like a backfire or firecracker going off, or more of a thud like maybe something kicked up on the road and contacted the skid plate? Rough idling could mean a bad MAF. If the MAF isn't working correctly, you could have excess unburned fuel getting into the cats. Once the cats and the exhaust get hot enough, bang. Just a theory that could fit with your symptoms. Does the CEL come on when you first turn the key? (ruling out a burned out bulb).
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2000 986 S - "The Black Widow"
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The Black Widow
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