What's wrong when car dies while you are driving?

I have a 2001 Malibu with 60,000 miles. While driving the car the engine often quits. After coasting to the side of the road it will start up and run good again. Also, when turning the ignition switch on the fuel pump and gauge will often not activate and the door locks will cycle on and off. Sometimes the fuel level gauge would cycle on and off several times before it stays on and you hear the fuel pump. Then the engine would start and run normally. In an attempt to fix the problem the fuel filter has been changed, the fuel pump relay has been changed and the PassLock has been disabled with a 2200 ohm resister. The ignition key cylinder has also been replaced and the problem still persists. I now suspect the five reed switches in the plastic assembly behind the ignition cylinder that I have read about on the internet. These reed switches, which are controlled by the key cylinder, in turn control the start and run, the dashboard gages and accessories. So I removed the ignition cylinder with the electrical reed switches attached to the back. Disconnecting the two electrical plugs is a bit challenging. You need a hooked screw driver to push in the release tabs and a small mirror. The speedometer cable has a black release tab that also needs to be pushed in. However, it will not come out unless the ignition key is in the ON position. After removing the ignition assembly I carefully pried up the tabs that clip the black cover onto the back of the assembly. After opening the assembly I could see three sets of points were somewhat burnt with a slight ridge on one side. Using some fine body wet/dry sandpaper I carefully wet sanded the points close to original condition. After reassembling the ignition the car now operates perfectly and the engine no longer cuts out while driving. It is obvious to me that these reed points need to be cleaned every 60,000 miles in order to avoid an assortment of electrical problems.

seek a diag on this it could be several issues