Assalam o alikum.
The jerk in your Suzuki swift is because of the plug coils. The way to check the coil is
the insulator becomes yellow..
The another way to check the coil is to just remove the coils with the help of pliers and see if the car jerks. If the car jerks when you pull out the coil a little it means the coil is working fine but if its faulty it'll jerk less and catch the current from the sides.
I just got it recently changed my one plug coil was week and this is the same one. Rest of the other has white insulator and is working fine.