1993 Buick Roadmaster Q&A

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

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? -
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