Today, when I went to crank my truck the starter spun, but the truck didn't turn over. If I held the key on the truck would eventually turn over, but it wouldn't stay running. I'm thinking bad starter, bad flywheel, or CKP sensor. Any thoughts?

The truck is a 2005 1500 with a Hemi.

 

As in turn over, do you mean the engine isn't turning or isn't starting?

 

Mostly, the starter turns, but nothing else happens. Eventually, the engine will turn and the truck will start, but it will not keep running.