My camaro is a 1994 3.4 5spd and after it sits for a while it has trouble starting but after that it runs just fine. does anyone have any advice??

 

could be the battery...more details would be great

 

It cranks fine, new battery, only when it sits for 5 or 6 hours, some say it could be a plugged fuel filter, I just bought it, the guy put new plugs in. Is there any sensors to clean? Would the fuel pump cause this problem?
Thanx