I have a 2003 F250 6.0 that is currently having a couple of issues. First being that it idles around 1,000 rpm when in park all the time. Second being when in drive and stopped it idles all over the place. Tends to surge forward also. The idling issue is erratic. It tends to jump all over the place and almost sounds like it's going to stall. I pulled out the EGR valve and it was dirty. Cleaned and installed with no change. Any suggestions? Thanks in advance.