Change coil for cylinder 4. Still missfiring, spark plug looks OK. Any ideas????
thanks, gary

 

Should replace the spark plug anyway as a missfire can foul the plug even if it does look ok. Check for a vacuum leak at the intake manifold gasket. Spray a little carb or brake cleaner near the gasket and see if the missfire quits. Pay special attention to the underside of the manifold gasket area near the outer corner as this is a very common spot for the gasket to rupture.