Make sure the ballast resistor is in place. Some people remove them thinking they will get a better spark. This makes the coil run too hot. To verify, measure the voltage at the coil. You should have around 9 volts (if memory serves) at the coil + lead when the engine is running.You don't want 12 or more volts at the coil, it's not designed for that much voltage.
Check to see if you have an exhaust leak. This can fill the engine compartment with CO (carbon monoxide) after awhile and that does support combustion like O2 (oxygen). Once you open the hatch to troubleshoot, you let fresh air in and the engine will run fine again. Try running with the engine hatch or cover open and see if it stays running.
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