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The bucking happens under load or at idle. It only happens within the first 10-15 minutes after starting for the first time of the day. After two or so turn-off the ignition and restarting, it runs great and of course, by then the car is much warmer. The Porsche technician unplugged the cylinder head temperature sensor and cleaned the contacts yesterday evening. I have not started the car today for driving but will do so tomorrow. I am curious and hopeful that will cure the problem.
Thanks to all for the help and will get back tomorrow with an update.
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