We have a 2003 6.0 and the CE light came on me about a month ago. The truck has beein sitting in the garage due to winter. Well before i parked it the truck would idle around 900rpms. and when u first start it it will rev up by itself. Ive also notice when your driveing down the road and let out of it it dont go back to normal idle it says at 1000rpm's and if u drop it in Netural the idle is normal but when i go back in drive it goes back up to 1000. Any ideas what it might be?