This is what happen ill tell you the hole story my truck has been running rough when in park the idle will be sitting at say 900-1000 rpm but then bough down to like 4-500 but it stayed running that was going on for about a couple of months couldnt figure out what it was there was no engine light on ... But now once i start the truck it runs for like a min then when it boughs down it just stalls out but this only happens when in park or neutral but if the truck is in drive or any other drive gear it doesn't do it and now i have the engine light on ? Truck isn't on the road right now for the winter so i have no way of getting it to the shop to see what code come up so i was wondering if any one else had this problem ? ?