2001 Saturn SL1 with 360,000 miles - It sputters at cruising speeds, but as soon as you floor it, it stops sputtering. Then you get back up to speed and let off the gas to stay at that speed, it starts to sputter again. I've changed the plugs, wires and O2 sensor.
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Is your check engine light on ? Should be on dash a yellow light that says (check engine soon) If it is go to your local Auro Zone and they will run a code scanner and give you a detailed readout on paper as to what the codes say is the problem,,,,,,,,,,,,,Im thinking your oxy sensors are bad, But you go check it out.