Hemi idle

My 08 hemi ram just started to get a slight drop of the idle,while in traffic..I don't have an issue otherwise,just while sitting in traffic I'd dips ,sometimes almost stalling sometimes not as bad..the truck hasn't stalled yet the ecu catches it ..in a ten mile drive home from work it will do it say 4-5 times..
Any help is appreciated,I just cleaned the volant filter,n plugs were done say 2 yrs ago.ill done them again if need beaut I'm sure there other maintence I need to do at 85 k..
Truck has a tuner,diablo cat back and a cai only