Car starts but will not stay running,

Check air filter and clean throttle body replace fuel filter if have not done so in a while add Lucas Fuel Injector Cleaner to gas tank.

If it was running properly before making the repairs (except for the overheating issue) it has to something you have done. Make sure timing belt is properly installed, go over all electrical connections you may have come into contact with, make sure you didn't get sparkplug wires on the wrong sparkplug (if this applies to your vehicle) and make sure air box connections aren't leaking.

airflow sensor