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2006 997S X51 engine hesitation

Engine

Vehicle Information: Model : 911 Club Coupe S w X51; Year: 2006; Mileage: 12750;

On four occasions i have had the engine up to operating temps in humid, hot(90 degree weather) and suffered from not just hesitation but "bucking" as if the gasoline supply is being interupted. the engine was fine at idle and at wide open throttle. i increased not only engine speed but ground speed and things settled down after 5 minutes or so. Of course when i take it to the dealer they cannot duplicate the issue. On a couple of the boards i have seen multiple posts on this issue. any ideas?

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