Rough Idle Questions?

[way2qk4u2c]

Just today i experienced something weird...

I to have been having a rough idle lately (not sure if its normal since ive never owned a truck until now) but today while at a stop light the truck wanted to die- the rpms at idle was surging trying to die and after a few seconds the truck went back to idle (never completely turned off) i have full power still but what would cause this?

Right now my edge is at PHP getting a upgrade so currently my truck is stock configuration.

I didnt get a check engine light during this?

Is this possible bad fuel filter or dirty throttle body?

Also i dont know if this has anything to do with it...but you know how when you start to take off from a light and someone in front of you stops suddenly so you let off gas and hit brakes. Well right when i left off the truck wants to dip way low on the rpms below idle speed almost to the point of shutting down? does your trucks do this? i wonder if my idle is slightly to low?