idle issues?

[ns954]

My PSD has a very slight idle oddity that has just recently began.The other day,while the truck was completely warm,the truck had a slight "hit" while it was idling.Only did it a few times then it disappeared.Today i noticed a slight "hunting" while the truck was idling.The tach even registered it.As before,the engine was fully warmed when this happened.Idles smooth as silk when cold.The fuel filter was changed 2,000 miles ago.No codes.Runs fine most all of the time.I hope this is not a sign of a bigger issue.It seems to have just began to happen.Any ideas?

[99bigred]

dont know but maybe a CPS