@zahahmad bhai there are no issues with the engine mechanics make up this bullshit to cover their incapability to repair it. and what in the world has the Crank shaft has to do with the Gaskit?
Does you car heat up or not?
Bhai if the ignition coils are short it can do that. it is common with every car that if the ignition coils are short cars will jerk due to fluctuation in the Spark. Throttle body needs to be serviced and also check all the vaccum hoses for leaks. Also keep in mind if the tappets were properly adjusted? Also check the HT leads and injectors.!
Also kindly use a good quality coolant with a T-Stat Valve and Auto Fan (Basic Factory Settings).