mule

My son has a 2001 Accent (the largere 1.6 liter engine) that just started
to misfire. He went to an Autozone and the guy there said the code was a
misfire in no.1 cylinder. He checked the plug and the plug wire and he
said it looked OK. Could a bad injector cause this misfire?? What kind of
a job is an injector replacement??

Thanks for any help!