truck has moments where it does not want to stay on

You need to test things when the problem occurs , check for good ground at fuel pump , Some vehicles are particular about fuel pressure just having it won't do . Look for any obvious wiring problems/corrosion at disconnects/along frame rail . Mice can invade even a daily driver .

On a twenty year old truck, the first thing I'd suspect is a broken ignition switch. Everything's fine, and then it loses its electrical connection which causes the engine to die. There's likely a damaged connection that shorts out and heats up quickly. Then it takes several minutes for it to cool and restore the electrical connection.

Throttle body may require cleaning, throttle position sensor may need to be replaced, sit in driver seat turn ignition to on don’t start vehicle, depress accelerator slowly to the floor, release and start engine normally, check operation and idle rpm.