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My 2000 Ford Taurus has 118K mileage on it. I have this car for three years. I changed its fuel filter and air filter last summer. Its engine light is on for two years. There are two error codes. One codes reads oxygen sensor or something. I can't remember exactly. The mechanic told me not to care about it.

During the past two months, the engine shakes periodically (once every 4~5 seconds) from front to rear when the car is at idle. I can see the engine speed jumps between 600~900 RPM when the car shakes. Occasionally the speed dropped to zero and the car stalled. I had to restart the car at green light.

I "Googled" and am puzzled at so many possible causes for a stalled and shaked engine. Please help make a diagnosis.
 

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BTW, your O2 sensor is shot. That code means the O2 sensor is not responding, should have been replaced 40,000 miles ago as a maintenance item. Replace both upstream O2 sensors and begin the vacuum leak hunt.

Also find a new mechanic. Any mechanic that tells you to ignore a problem is a problem himself.
 

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