This started Sunday. When I'm slowing down to a stop in neutral or downshifting I come to a complete stop. I get a higher than normal idle. 1200-1500. It does not matter if I'm in gear or neutral. It does this intermittently. I have the truck idling right now and it's normal. Earlier today I got a CEL P0420 I didn't clear it; it went away.
My truck is a 2003 2.7 5 speed