Crank shaft position sensor

Hi guys, I've been having problems with my rodeo dying when I stop at a light or stop sign. The car runs fine, no rough idle. It just dies sometimes when I stop and idle. The car doesn't do this until I drive for 15 minutes or so. I cleaned out the throttle body and replaced the air filter but that didn't help, so I took it to the mechanic and they said it could be the crank shaft position sensor. Have you guys heard of this before. I also have the fuel sending unit problem could that have anything to do with it? Any input would be greatly appreciated Thanks.

2001 Rodeo 3.2 2wd 100k miles

What year/engine?