2007 Chevy Cobalt check engine light

2007 Chevy Cobalt 4 cyl Front Wheel Drive Automatic

check engine light came on had codes erased and a week later it started runnin rough and the ck engine lite came bk on took it to a dealer and they pulled up the code that the 4th cylinder was misfiring they cleared it and seems to be runnin ok but they said it will come bk on they suggest I get the fuel injectors cleaned or replace the 4th spark plug or wire