Why does my 2008 chevy impala hunch while driving? on 2008 Chevrolet Impala

Chevy says not ready or tune up. It has 79000 miles on it.

Asked by for the 2008 Chevrolet Impala
Hunch???? explain please

the car jerks I thought maybe bad gas or plugs. it smooths out when I apply the gas pedal.
plugs are a good start but wires are also a possibility. if you are going to do the plugs, take the extra time and replace the wires also.

Thank you for your time.