I have a F150 STX 4wd with a 4.6L V8. I changed the plugs and put a new COP on the #5 plug. When I drive and stop the engine stall out and the engine light and the battery light comes on. Does anyone have an idea what causes this before I take it to the dealer to get fixed?

 

I would check all of your vacuum lines. Maybe you bumped one loose when you did the plugs.