Hello all.. I have a 1980 grand prix lj. With the 4.3 265 v8. When i go out to initially start it it will fire up and stay running.. If i come back out say half an hour and try to start it again. I get continuous crank. I put a new carb ,cap rotor button , plugs and coil on it. Vacuum lines dont look to bad. Could it be an egr valve malfunctioning? I have no idea what it is and it is stressful. Any help would be greatly appreciated!