helloxuan
that is normal...as the converter changes the position of the gears....

try shifting (with brake pressed fully) from N> D after few sec shift back to N > R......for few times...u can hear some "machenical" sound when u shifting....if yes then i guess its normal

1st: yes, becasue persona is so heavy 1200kg...
2nd: yes, my persona facing the same issue, when after turning left and go in straight direction a while, the KOK sound also come out, can feel on the fuel pedal also...anyone solved this problem?
3rd:i dont have this problem.

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Added on October 8, 2009, 9:12 pm
yes,  i had this problem also on my 3 months old persona, finally i found the cause, it is because of 1 hose (rubber pipe) on the top side of the engine (on top of the crank pulley) went the wrong path, the hose should be power steering hose or aircon hose, cant remember, it stuck beneath the metal frame/support, so when you pull the gear from N to D, the engine tilt forward, and stretch the hose and the irritating shaking sound will occur.

Just put the hose on top of the metal frame/support so it wont stretch by the engine then no more sound liao...