Some Buick Century owners report experiencing jerking while driving at speeds above 65 mph, particularly after replacing the head gasket and fuel system. This issue may stem from engine or transmission problems, which can contribute to the jerking sensation. Additionally, complex drivetrain issues are known to cause vibrations at higher speeds. Owners have also noted that worn or damaged suspension components, such as shocks and struts, can lead to similar vibrations when driving between 60 and 80 mph. It is recommended that owners have a mechanic inspect their vehicle to accurately diagnose the specific cause of the jerking issue following these repairs.
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