回複：問個油門的問題

In your case, when engine becomes warm, the problem disappears. If it were fuel pump problem or clogged fuel pipes, the problem sould never go away. It is the oxygen sensor issue. The oxygen sensor needs be replaced. Reference to the http://web.wenxuecity.com/BBSView.php?SubID=auto&MsgID=285580, for how to do it yourself.