cars been running fine for months its a 1.4 ford focus.
When i let off my accelerator best way to describe it is the car feel like its jolting backwards and forwards when de-accelerating in a low gear.
Like when im in slow moving traffic and rolling in first gear and i go to accelerate the car like jumps then if im to take my foot off the accelerator it jolts any solutions of fixing it or is it something im going to have live with?

at first i though it was sparks but they've been changed recently and HT leads im unsure of where to start looking?