P0304 code - cylinder 4 misfire? on 2010 Chevrolet Equinox

I switched coil pack and that did not correct it I also put a new spark plug in it, even though I put 4 new ones in back in May, and that did not correct the problem. Can some one give me some help on what might be causing this code? The engine is skipping a small amount(not bad) at idle. Thanks very much in advance.

by in Kimberly, AL on October 16, 2013
4 answers 1 comment
ANSWER by on October 16, 2013
Do a compression test, and/or injector test. Test power ground signal at connector at coil.
COMMENT by on October 16, 2013
Thanks very much for your help. I will attempt to get that done tomorrow.
ANSWER by on October 16, 2013
agree with #1
ANSWER by on October 16, 2013
Also check for a vacuum leak near #4
ANSWER by on October 17, 2013
poss injector or wiring at inj or coil pak