Bitemark46

My wifes 01 z28 keeps having the same problem over and over. We took it to a local shop and they replaced the ignition relay and starter relay. Well 2-3 months down the road it acts up again to where it will turn over but not fire. So they replaced the same relays a 2nd time. Everything worked great. Now 2-3 months down the road again same thing. Wont' start. I could notice that the relays were going bad cause the car would start to start up on the 2nd turn of the key. If I turned it over the first time it would just turn over and over and never fire. But once I stopped then turned the key again it would fire right up. What could be the problem? I'm so frustrated to the point of selling the car. Thanks. -Mark