2001 Cadillac Deville Will not idle

I have a 2001 cadillac DeVille, and starts up fine but then quits. If feather the gas to get going, it runs fine at any speed, but when I slow down to stop it quits at idle. Have found if I run at freeway speeds for 1/2 hr or so, then it will idle.
I had recently disconnected the battery cables to repair a broken wire to the driver side rear door that run the window and locks.