1996 F-350 Dump 7.3L...Rough Idle

Just bought a super clean dump truck with the 7.3L. Has very good power but at idle has a little shake to it. Is this normal? It also has a 5 speed. Has only 73,000 miles on it. Any ideas about the slightly rough idle, it did sit for a little while. Thanks

The 7.3 do shack a little it normal just put some 911 injector cleaner in the take when you fill it up change the fuel filter and see what happen .96 with 73000 on it its still new good find