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Just went through the same problem car was sputtering gas milage went way down was running very rough it felt like it was going to stall everytime I came to a stop,I changed everything you did still the same,then I changer the O2 SENSOR the top one by the manifold car is running great now sensor is about 70-80 dollars very easy to change just remove heat shield and it's very to acess

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Q: Your Honda civic 1999 is sputtering and you have changed the plugs and wires and fuel filter The problem is still there The mechanic is telling you it is either the computer or sensor can anyone figur?
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