Hard Start/Rough Idle

Hey guys, after my truck has been sitting for a few hours i have to hold it over to get it started. It cranks and tries to start but just takes about 10 seconds to actually get running. If i have it off for only a half hour or so it starts right up... Also i have a rough idle. I changed the spark plugs, wires and cap but no help. My RPMS stay steady but it just kinda shakes while im idling. Any ideas? Its a 1997 5.9L w/ 120K

Hey guys, after my truck has been sitting for a few hours i have to hold it over to get it started. It cranks and tries to start but just takes about 10 seconds to actually get running. If i have it off for only a half hour or so it starts right up... Also i have a rough idle. I changed the spark plugs, wires and cap but no help. My RPMS stay steady but it just kinda shakes while im idling. Any ideas? Its a 1997 5.9L w/ 120K

check your fuel pressure sounds like it leaks off