as far as the main relay issue I have a little experience with this myself. I had a '93 delSol Si that had main relay issues. However, mine wouldn't die it would just not want to start. Like stated above the fuel injectors wouldn't get power. I had to turn the key to accessory and then off until I heard them then it would start fine. I never had an issue with the car dying though after it was running (like when idle at an intersection).