I own a nissan almera B16 and recently when I depress the accelerator for a quick increase in speed and try to engage the "kick down " the engine miss fires but don"t stall When I took it for repairs there was no problem detected. After a few the problem recurred. As a driver when I first encountered this problem it felt as if the engine was starved of either gas or air. When the technician drove the vehicle he detected no problem(I was with him when the test drive was done), yet the problem still exist. What can I do now.