Starts and stalls

I own a 1998 Chevy S10, 4.3 liter (X) engine, two wheel drive extended cab. About a week ago, I drove 10 min. To the store, got back in the truck, and it started and stalled after about 1 to 2 seconds. I came back to the truck about a half hour later and it was fine.. Two days later, it did the same thing, but I don't believe I had driven it yet that day, the engine may have been cold. I replace the fuel filer, the fuel pump is pumping at 58 psi. It then started fine.
Now today, I drove to the store, about 10 minutes, get back in the truck and it starts, then stalls after 1 to 2 seconds. I'm lost on this one, fuel pump relay, or ignition switch? I'm not even sure where those are located.
Thanks,
-adam