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2005 mercury sable check engine light

The check engine light has been on for about 10,000 miles. The code shows a cylinder is misfirng ( #4 I believe ) The engine is running a little rough and no mechanic has been able to isolate the problem. One wanted to rebuild the cylinder heads for 3000 dollars. One got the light to go off for a few days by spraying a fluid on the engine that created what he called a vacuum and said the problem may be the intake manifold gasket The car is running but is a little rough (60,000 miles) I bought the car with 10,000 miles and has been maintained. Any help would be appreciated bob ridgewood new jersey

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Usually leaking intake gaskets will not set a misfire code but will set a lean code P0171 P0174 does the miss worsen in bad weather? Check the coil pack for cracks check the wires and plugs try spraying water on the coil and wires to see if it worsens

Posted on Nov 23, 2008

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ganyapr_17.gif

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