5.9 running rough after warm up
 

Hi Everyone. I've got a weird problem with my 99 Dodge 5.9. First thing I noticed is that when I stop at a stop sign, the idle doesn't drop down the way it used to, seems to be running high ( around 950). Then after about 5 minutes driving it starts to idle very rough, doesn't sound bad when you rev her up, but rough when she's idling. Seems to get worse the more you drive. I had a friend check it for codes and it shows nothing, turbo seems good too. Really at a loss here, anyone ever have this problem before? Thanks