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Originally Posted by wvicary
Have you checked for any codes in the transmission? If not do so and post them here. Sometimes all that is needed is the adaption/kickdown switch values reset.
The odd time this could be caused from the battery being changed or it's voltage getting to low.
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Thanks for the reply.
I just had the battery disconnected for an alternator and starter maintenance. So the poor shifting maybe only the adaptation process (that's good news
), but for the vibration problem at 2000rpm, the torque converter might be the cause. And in response to the other post, it was check by a Porsche technician and I got no error code on my tip before disconnecting the battery.