about a month ago i got a CEL for my Cat so being dutiful I changed not ONLY the Cat but also both O2 sen. as the car has 250K on it already
after doing that my car ran fine for a few weeks then threw a code for the EGR system so i replaced the EGR valve and cleaned out the egr plumbing...I figured since the hood is up anyway ill do a lil maint. changed VC gasket plugs wires dizzy cap and rotor....started the car it ran beter than ever...for 10 miles developed a terrible misfire and threw the blinking CEL.....what can cause this...ive checked valve clearance, plugs plug wires and made sure everything was properly gapped and wires where they were supposed to be....im thinking coil but would like some input....thanks in advance

after cleaning egr plumbing and replacing valve that code stayed clear
#1 cyl is firing no doubt....other plugs look box new
misfires until u get to speed then seems to settle down until u hafta accelerate again