2011 civic P0304

Question

I had P300-304, found I had a clogged converter and a bad EGR valve. Replace the two and after a short bit of smooth driving I loose power and acceleration and Cyl #4 has steady/consistent misfire. Swapped plugs, coils, and injecter, miss stays #4. Compression is good. Turn engine off and it runs good for about 300 yards

Answer 1

Sparkplugs, when you catalytic convertor you can burn the sparkplugs, you did coil and injectors what may look good may not be good, swap the sparkplugs