1993 Dodge Caravan 2WD 3.3L 240000 miles

My problem began a few months ago with my brakes. They were squeling like little pigs so I thought it would be a good time to change them. I picked up new pads and calipers, and proceeded to make the repair. After I got done getting down and dirty and was all done, I took it for a spin. Brake lights still continued to come on? Do those need to be bled while the vehicle is running? Then I drove it for a few more days, it still stopped allthough sometime the brake pedel went all the way and sometimes not much at all, it stalled out on me. I didn't think much of it, and started it right back up. Then I had a bad day. I went to the store. It drove fine there. After coming back out not 10 minutes later, I started it, shifted into reverse, and it stalled out again. Then I tried to start it and it would crank but not fire. I towed it home and parked it in the garage. I thought it was the fuel pump, so I picked one up and started changing it. I figured I would test the old one out outside of the fuel tank, before tossing it and it worked fine. So I then put it back in(the old one). When I got everything back to the way it should be, I then tried to start it. It would crank but not fire. Again. So I used an inline spark plug tester on one of the plugs and it was a very weak test. I decided to test another. This time it started right up. Tester on. I then let it run for a bit to check it out and charge my battery a bit. About 15 minutes later it stalled out. I turned the key and it started then stalled again. Now once again it cranks but does not start. Please help me stop the ball of confusion in my head and tell me how to fix my van?