Autozone did a check engine code readout and it said misfire in cylinder 3. Car runs fine. What can I fix to stop this check engine light from coming on?

 

Welcome to the forum,the most obvious is change a plug wire or plug itself. Do this little trick crank your engine at night in a very dark place raise the hood and look for sparks coming from the no. three plug wire if you see them there is the culprit.

 

Thanks very much for the suggestion. Is there anything serious that could be wrong or is this most likely the problem.

 

Other than be annoying and loss of mileage no. Did you find out what it was?