2004 intrepid

I have a 3.5 Intrepid 2004. Will run fine then just lose prower and
die. No reasoning to it. Have put new cam and crank sensors in, can
hear fuel pump running. It will start sometimes right away other
times after a few minutes. I had it to Dodge dealer, they check
everything out and couldn't wrong anything but the o2sensors (2 of
them) are reading bad. Can this be the problem?

 

Check the error codes.

If there are no codes, then:
Does it just stop dead, or sputter out slowly? I've had electric fuel
pumps that would work fine when cool, but begin to bind up as they get
warm causing fuel pressure to drop off so the engine would sputter away
and die. Get your mechanic to drive it around with a fuel pressure gauge
temporarily installed (taped to the windshield where it can be seen)
and see if the fuel pressure drops when the power begins to drop.

 

Perhaps bad/failing ignition switch