1997 Chevy Silverado 1997 Chevy Truck won't start

I am so frustrated. I've had my truck towed twice to my mechanic and we are at a loss.
Problem. The truck overall has been awesome. Now it won't start intermittently. I drive it for a week, it starts great. Then all of a sudden, the engine turns but no fire. I had it towed to my mechanic and we checked the pressure at the Fuel Pump and it was a little low so we replaced it. The truck then started and ran great for a week. I went out last Friday, same problem, would not fire. I had it towed again to my mechanic and when they let it down off the wrecker, it started. It's started now for 2 days but I am scared to take it out of town. I was reviewing the forum and see that 1997's have had a history of a bad ignition switches. Would that cause such a problem? I would sincerely appreciate any thoughts you may have. I don't need another tow. Sounds like something electrical to me. Rick.