idle issue

[epowers777]

I'm still bugged about my idle. My buddy rode in my truck and thinks its off too. Sometimes its smoothed then other times it shakes the hole truck. When I take my foot of the brake and don't hit the gas the truck slowly lurches forward with the idle. what confuses me is sometimes it really smooth.
I got a brain fart here please deal with it!
The sensor that's on the bottom driver side of the hpop pump would that possibly be going out?
Thanks


Ps on my Droid.