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

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Chevy says not ready or tune up. It has 79000 miles on it.
(1) Answer
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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.