chevy gear heads

Continued to have problems. same thing turns over will not start. then on another day Turns over and starts. Then try it later will not start. I have replaced Ignition module, cap and rotor. It was in need of a new cap and rotor. So the problem is intermittent . Talked with a guy who is a chevy gearhead thru and thru and also an electrician . He suggests that the Relay is bad. Finally found the relays on a forward chevy chassis they are not in a box under the hood like most vehicles. Changed out Relay and away we go. It starts. I cycle the ignition multiple times and started every time. Will try it again later to see if problem is resolved. Thanks for all the help.