2004 F150 4x4 engine dies when i stop

My 2004 F150 dies sometimes when i come to stop, or right before stoping. I took it to the dealer still under warrantie but they won't find anything. Does anyone has an idea what it might be?

Yes get them to re flash the computer or get them to replace the computer and everything will go away, had the same problem and they replace the computer and all is good.