Weird problem of jerking forward when at a stop

[donaldjlim]

Hi guys,
Hope you guys would be able to help me on this problem I am currently having with my 2005 Aveo 1.5 LS.

Earlier today it was raining heavily, and when I am at a standstill at an intersection, the car jerked forward a few times. It's an automatic and it's in D. The jerks happened in quick succession. FYI my AC is on.

A month ago, it's the same thing. It's also raining heavily.

So far it happened twice. After each jerking episode, i tried to replicate it again by running over puddles etc (to replicate the "wetness") but can't. After the jerking, and once I am on the move, the car behaves normally.

Strangely, it had happened on the same stop along the intersection, twice.

Any ideas of what may be happening? Thanks in advance