I have 5 speed 1.8 petrol. But couldn't find the 1.8 section. When I take off in first gear the car jerks crazy like loudly and continuously like it's not getting enough juice. 2nd is fine. Just first gear. I get over the jerking by going up to around 3000rpm and its ok. Got new plugs wires and coil. It helped but not perfect. Any ideas?