Superb MkII 1.8tsi vibrating and loss of power

Yesterday, I was driving my Superb MkII 1.8TSI DSG at about 50 kmph and suddenly i felt loss of power, the car was unable to pull for a few seconds. The check engine light started flashing and went off in about 1 km. the car was then pulling comfortably but there were little vibrations. As soon as I came to a halt at the parking bay, the EPC light came on and stayed on and also the car was vibrating. I switched off and turned on the car, no lights but the car was vibrating heavily and the rpms were fluctuating on neutral. The rpms went stable between 800~850 rpm after a minute but the vibrations still exist. The car feels a little loss of power at lower speeds and low rpms, post 1800 rpm the car pulls smooth. I suspect a bad spark plug but anything else?