how do you fix a cylinder four misfire for 2003 ford taurus?

elfin04842004

New member
complete tuneup has been done, plus recent change of spark plugs. I have had two mechanics within the last month tell me there is nothing wrong with the car, yet the check engine light flashes sporadically (it does not always flash) telling me I have a misfire. When the check engine light is not flashing the light just stays on. HELP!
 
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