What can possibly be wrong w/ my Buick?

Latina D

New member
I have a 2004 Buick rendezvous with approx 76k miles. just after my recent trip south, My car slightly jerks when I reach 20mph and then a harder jerk at 30mph. no lights or indicators are on, I just want to know what to possibly expect so I can get prepared. Can anyone help?
 
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