im using 2006 chevrolet optra 1.6 problem come out this few days , starting the hold light is blinking when speed around 60-80 or 100-120 km/h  ,last few days when my car stoped and  is in N mode ,i switch to D mode is not moving at all , same to all other gear , what i do is swich off and on again to my car  repeatly nearly 6 times only it work and stuck in 30-40 , i send to workshop that guy said gear box filter dirty , he clean it  . now gear can move , but still felt not so smooth and hold light still blinking any shifu any idea for it?

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Added on January 31, 2012, 2:10 amand from my research people said it mightbe P&N Switch Faulty , is it posible?

could either be the P-N switch or the wire harness