2003 Honda Civic misfires on startup

My 2003 Honda Civic misfires at start up for about 10 seconds then corrects it self. I replaced the plugs and it worked fine for a couple of days then it started misfiring at startup again. I have been getting random codes for individual cylinder misfire. Does anyone have ideas on what it could be or what to check next?

Thanks,

JC

How many miles on the plug wires? I recommend OEM plugs and wires.