99 Dodge Ram 5.2 318 wont start after I drive

So I’m trying to figure out if I need to replace my
crankshaft position sensor or cam shaft sensor on
this . So my truck starts in the morning fine but
after I shut engine off .(say walk into grocery store )
if I come out and start car I get only a crank no
start condition . I have verified fuel pressure as well
. . So now I’m wondering locations on these
specific parts . I’m getting different answers from
different people . What sensor is inside the
distributor cap , and sits underneath the rotor . It’s
a round ring and wires come out and attach to a
connector? And is my crank shaft sensor the other
connector next to the distributor connection which
leads down to the top of tranny and has 2 bolts .
Seems you can only reach it from behind
passenger tire