My 2000 GM sputtered and died the other day all of the sudden. Found out there was a fuel cut off switch in the trunk that was tripped. Now the car loses voltage when trying to crank (from 12.8 to 8). I have changed the battery and the starter. I can turn the engine with a breaker bar so it is not locked up. Does a 2000 GM have a start solenoid on the firewall? Can the fuel cut off switch pull voltage like that?