what could be making my car jerk and backfire when it get up to the speed of 20? on 1993 Buick Roadmaster

when i crank my car and put it in first gear and as it start to take off,its start to jerking at the speed of 20 and as i try to give it more gas it start jerking. what could be the problem?

Asked by for the 1993 Buick Roadmaster