Contour Enthusiasts Group Archives Forums General Troubleshooting Stalling but radio stay's on

I have a 96 contour and ever once and a while it will stall but the radio stays on but loses power steering.I shut off then restart and for the rest of the day no problem.This happens only once per day but is a problem in traffic.I just changed all the sparkplugs and wires but was going on before I did this.Also when at a light it feels like it wants to stall but doesnt,when on the brake.Could this be a bad cat