jolt

Hi, just wondering if anyone could give me an idea of what the cause of this problem is before i go and get it looked at. When I put my foot on the accelerator especially after just changing up a gear, there is quite a strong jolt. This usually lasts a few minutes then it will be fine again and...

I drive a 3cyl 1.2 12v, which, ever since i bought it, has had a real problem with smoothness in the lower gears... Lifting off the throttle (even lightly) in 1st or second gear causes a HUGE painful jolt to resonate through the cabin, and the whole car jerks back. this is regardless of revs...